diff --git a/build/Android.mk b/build/Android.mk
index 5d36d14df..9a27edc9f 100644
--- a/build/Android.mk
+++ b/build/Android.mk
@@ -113,7 +113,8 @@ ANDROID_SUPPORT_LIBRARIES := \
     android-support-v17-leanback \
     android-support-multidex \
     android-support-multidex-instrumentation \
-    android-support-design
+    android-support-design \
+    android-support-percent
 
 $(foreach lib, $(ANDROID_SUPPORT_LIBRARIES), $(eval $(call _package_sdk_library,$(lib))))
 
diff --git a/build/sdk.atree b/build/sdk.atree
index 41094a870..c7cb28a89 100644
--- a/build/sdk.atree
+++ b/build/sdk.atree
@@ -498,6 +498,11 @@ frameworks/support/design/res
 frameworks/support/design/src/.readme                                                             extras/android/support/design/src/.readme
 ${OUT_DIR}/target/common/obj/PACKAGING/android-support-design_intermediates/android-support-design.jar    extras/android/support/design/libs/android-support-design.jar
 
+frameworks/support/percent/AndroidManifest.xml                                                     extras/android/support/percent/AndroidManifest.xml
+frameworks/support/percent/res                                                                     extras/android/support/percent/res
+frameworks/support/percent/src/.readme                                                             extras/android/support/percent/src/.readme
+${OUT_DIR}/target/common/obj/PACKAGING/android-support-percent_intermediates/android-support-percent.jar    extras/android/support/percent/libs/android-support-percent.jar
+
 ##############################################################################
 # Tests Component
 ##############################################################################
diff --git a/samples/SupportPercentDemos/Android.mk b/samples/SupportPercentDemos/Android.mk
new file mode 100644
index 000000000..6395a84b2
--- /dev/null
+++ b/samples/SupportPercentDemos/Android.mk
@@ -0,0 +1,35 @@
+# Copyright (C) 2015 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LOCAL_PATH:= $(call my-dir)
+
+# Build the samples.
+# We need to add some special AAPT flags to generate R classes
+# for resources that are included from the libraries.
+include $(CLEAR_VARS)
+LOCAL_PACKAGE_NAME := SupportPercentDemos
+LOCAL_MODULE_TAGS := samples
+LOCAL_SDK_VERSION := current
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+LOCAL_STATIC_JAVA_LIBRARIES := \
+        android-support-percent \
+        android-support-v4 \
+        android-support-v13
+LOCAL_RESOURCE_DIR = \
+        $(LOCAL_PATH)/res \
+        frameworks/support/percent/res
+LOCAL_AAPT_FLAGS := \
+        --auto-add-overlay \
+        --extra-packages android.support.percent
+include $(BUILD_PACKAGE)
diff --git a/samples/SupportPercentDemos/AndroidManifest.xml b/samples/SupportPercentDemos/AndroidManifest.xml
new file mode 100644
index 000000000..4a7b22b80
--- /dev/null
+++ b/samples/SupportPercentDemos/AndroidManifest.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2015 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<!-- Declare the contents of this Android application.  The namespace
+     attribute brings in the Android platform namespace, and the package
+     supplies a unique name for the application.  When writing your
+     own application, the package name must be changed from "com.example.*"
+     to come from a domain that you own or have control over. -->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.android.support.percent">
+
+    <uses-sdk android:minSdkVersion="7" android:targetSdkVersion="21" />
+
+    <application android:label="@string/activity_sample_code"
+            android:supportsRtl="true"
+            android:icon="@drawable/app_sample_code">
+
+        <activity android:name="SupportPercentDemos">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+    </application>
+</manifest>
diff --git a/samples/SupportPercentDemos/res/drawable-hdpi/app_sample_code.png b/samples/SupportPercentDemos/res/drawable-hdpi/app_sample_code.png
new file mode 100755
index 000000000..66a198496
Binary files /dev/null and b/samples/SupportPercentDemos/res/drawable-hdpi/app_sample_code.png differ
diff --git a/samples/SupportPercentDemos/res/drawable-mdpi/app_sample_code.png b/samples/SupportPercentDemos/res/drawable-mdpi/app_sample_code.png
new file mode 100644
index 000000000..5ae7701a8
Binary files /dev/null and b/samples/SupportPercentDemos/res/drawable-mdpi/app_sample_code.png differ
diff --git a/samples/SupportPercentDemos/res/layout/demo_1.xml b/samples/SupportPercentDemos/res/layout/demo_1.xml
new file mode 100644
index 000000000..0502e0dc0
--- /dev/null
+++ b/samples/SupportPercentDemos/res/layout/demo_1.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2015 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<android.support.percent.PercentFrameLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        >
+    <View
+        app:layout_widthPercent="50%"
+        app:layout_heightPercent="50%"
+        app:layout_marginTopPercent="25%"
+        app:layout_marginLeftPercent="25%"
+        android:background="#FF0000"
+        />
+    <View
+        android:layout_gravity="bottom|right"
+        app:layout_widthPercent="33.33%"
+        app:layout_heightPercent="33.33%"
+        app:layout_marginRightPercent="33.33%"
+        app:layout_marginBottomPercent="33.33%"
+        android:background="#0000FF"
+        />
+</android.support.percent.PercentFrameLayout>
diff --git a/samples/SupportPercentDemos/res/layout/demo_2.xml b/samples/SupportPercentDemos/res/layout/demo_2.xml
new file mode 100644
index 000000000..9fae5ffdf
--- /dev/null
+++ b/samples/SupportPercentDemos/res/layout/demo_2.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2015 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<android.support.percent.PercentRelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    >
+    <View
+        android:id="@+id/left"
+        app:layout_widthPercent="25%"
+        app:layout_heightPercent="50%"
+        app:layout_marginLeftPercent="25%"
+        app:layout_marginTopPercent="25%"
+        android:background="#FF0000"
+        />
+    <View
+        app:layout_widthPercent="25%"
+        app:layout_heightPercent="50%"
+        app:layout_marginTopPercent="25%"
+        android:layout_toRightOf="@id/left"
+        android:background="#0000FF"
+        />
+</android.support.percent.PercentRelativeLayout>
diff --git a/samples/SupportPercentDemos/res/layout/support_percent_demos.xml b/samples/SupportPercentDemos/res/layout/support_percent_demos.xml
new file mode 100644
index 000000000..80e1bf31b
--- /dev/null
+++ b/samples/SupportPercentDemos/res/layout/support_percent_demos.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2015 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
+        android:id="@+id/pager"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        />
diff --git a/samples/SupportPercentDemos/res/values/strings.xml b/samples/SupportPercentDemos/res/values/strings.xml
new file mode 100644
index 000000000..cd864c85c
--- /dev/null
+++ b/samples/SupportPercentDemos/res/values/strings.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2015 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<resources>
+    <string name="activity_sample_code">Support Percent Demos</string>
+</resources>
diff --git a/samples/SupportPercentDemos/src/com/example/android/support/percent/SupportPercentDemos.java b/samples/SupportPercentDemos/src/com/example/android/support/percent/SupportPercentDemos.java
new file mode 100644
index 000000000..0290eb384
--- /dev/null
+++ b/samples/SupportPercentDemos/src/com/example/android/support/percent/SupportPercentDemos.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.android.support.percent;
+
+import android.app.Activity;
+import android.app.Fragment;
+import android.os.Bundle;
+import android.app.FragmentManager;
+import android.support.v13.app.FragmentStatePagerAdapter;
+import android.support.v4.view.ViewPager;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+public class SupportPercentDemos extends Activity {
+    private static final String LAYOUT_RESOURCE_ID = "layout_resource_id";
+
+    private ViewPager mPager;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.support_percent_demos);
+        mPager = (ViewPager) findViewById(R.id.pager);
+        mPager.setAdapter(new Adapter(getFragmentManager()));
+    }
+
+    public static class Adapter extends FragmentStatePagerAdapter {
+        public Adapter(FragmentManager fm) {
+            super(fm);
+        }
+
+        @Override
+        public Fragment getItem(int position) {
+            PercentFragment fragment = new PercentFragment();
+            Bundle args = new Bundle();
+            switch (position) {
+                case 0:
+                    args.putInt(LAYOUT_RESOURCE_ID, R.layout.demo_1);
+                    break;
+                case 1:
+                    args.putInt(LAYOUT_RESOURCE_ID, R.layout.demo_2);
+                default:
+                    break;
+            }
+            fragment.setArguments(args);
+            return fragment;
+        }
+
+        @Override
+        public int getCount() {
+            return 2;
+        }
+    }
+
+    public static class PercentFragment extends Fragment {
+        public PercentFragment() {
+        }
+
+        @Override
+        public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                Bundle savedInstanceState) {
+            Bundle args = getArguments();
+            int layout = args.getInt(LAYOUT_RESOURCE_ID);
+            return inflater.inflate(layout, container, false);
+        }
+    }
+}