docs: Code sample for game controller training class.

Change-Id: I14f7046c7fba4f67838513af2ca2abbca4c3561a

samples/ControllerSample/src/com/example/controllersample/GameViewActivity.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2013 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.controllersample;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+public class GameViewActivity extends Activity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        this.setContentView(R.layout.game_controller_input);
+    }
+
+}