Create a new class WindowAndroid that serves the purpose of representing a native (platform specific) view where Chromium code expects to have a cross platform handle to the system view type. As Views are Java objects on Android, ViewAndroid.java and view_android.* will provide the expected abstractions on the C++ side and allow it to be flexibly glued to an actual Android Java View at runtime. It should only be used where access to Android Views is needed from the C++ code as there are easier/better ways to access Views from Java.

This new abstraction will allow to reuse AutofillPopup for regular use in a webpage (using ContentView) as well as for AutofillDialog.

BUG=229199

Review URL: https://chromiumcodereview.appspot.com/14018004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195750 0039d316-1c4b-4281-b951-d872f2087c98