CHerry pick Find WebView package name from a config resource. DO NOT MERGE

Use a config resource to determine the package name for the WebView
implementation to allow it to be changed by a resource overlay.

Original Bug: 16329371
Original Change-Id: I5977691c0223347e0382d584c3d3ee4428660180

Bug: 16723226
Change-Id: Ib0b4245f26cbf93f364aa0f30b231786931f9f16
3 files changed