The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6746292fcbe580399a2b09c3883ccb44bb6d9d80

commit 6746292fcbe580399a2b09c3883ccb44bb6d9d80
Author: liberato@chromium.org <liberato@chromium.org>
Date: Wed Jun 07 23:22:04 2017

Add AreOverlaysSupported native call.

Allow native code to query if Android Overlays are supported by
the embedder / device.

This has to be accessible from components/ , so it comes with a
content/public API.

BUG= 726403 

Change-Id: I8b0ac062572449b388dd487421b4bf06e9eeae04
Reviewed-on: https://chromium-review.googlesource.com/524752
Reviewed-by: Bo Liu <boliu@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#477768}
[modify] https://crrev.com/6746292fcbe580399a2b09c3883ccb44bb6d9d80/content/browser/BUILD.gn
[add] https://crrev.com/6746292fcbe580399a2b09c3883ccb44bb6d9d80/content/browser/android/android_overlay_provider_impl.cc
[add] https://crrev.com/6746292fcbe580399a2b09c3883ccb44bb6d9d80/content/browser/android/android_overlay_provider_impl.h
[add] https://crrev.com/6746292fcbe580399a2b09c3883ccb44bb6d9d80/content/browser/android/android_overlay_provider_impl_unittest.cc
[modify] https://crrev.com/6746292fcbe580399a2b09c3883ccb44bb6d9d80/content/public/android/BUILD.gn
[modify] https://crrev.com/6746292fcbe580399a2b09c3883ccb44bb6d9d80/content/public/android/java/src/org/chromium/content/browser/androidoverlay/AndroidOverlayProviderImpl.java
[modify] https://crrev.com/6746292fcbe580399a2b09c3883ccb44bb6d9d80/content/public/browser/BUILD.gn
[add] https://crrev.com/6746292fcbe580399a2b09c3883ccb44bb6d9d80/content/public/browser/android/android_overlay_provider.h
[modify] https://crrev.com/6746292fcbe580399a2b09c3883ccb44bb6d9d80/content/test/BUILD.gn