Add customtabs support lib to extras/android/support/

Currently the only way to get access to customtabs library through
download m2repository and using the aar file whereas all other
support libs are also present in extras/android/support/ with
the corresponding resources and jar file.

This adds the jar and manifest to the corresponding folder to avoid
the confusion to developers.

This is relanding
https://googleplex-android-review.git.corp.google.com/#/c/756492/
after it was reverted due to not having the corresponding Android.mk
change.

Change-Id: I21969994e1dd0bb4f9abbfa395cf284e3cfc396d

build/Android.mk

@@ -117,7 +117,8 @@ ANDROID_SUPPORT_LIBRARIES := \
     android-support-multidex \
     android-support-multidex-instrumentation \
     android-support-design \
-    android-support-percent
+    android-support-percent \
+    android-support-customtabs
 
 $(foreach lib, $(ANDROID_SUPPORT_LIBRARIES), $(eval $(call _package_sdk_library,$(lib))))
 

build/sdk.atree

@@ -519,6 +519,8 @@ frameworks/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
 
+frameworks/support/customtabs/AndroidManifest.xml                                                     extras/android/support/customtabs/AndroidManifest.xml
+${OUT_DIR}/target/common/obj/PACKAGING/android-support-customtabs_intermediates/android-support-customtabs.jar    extras/android/support/customtabs/libs/android-support-customtabs.jar
 ##############################################################################
 # Tests Component
 ##############################################################################