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This is patch 1/3 to move everything protected under
WebViewChromiumFactoryProvider.mLock into WebViewChromiumAwInit.
Patches:
1. Create WebViewChromiumAwInit and some methods for down-stream use.
2.  Update the down-stream glue-layer to point to
WebViewChromiumAwInit methods.
3. Move code from WebViewChromiumFactoryProvider to
WebViewChromiumAwInit.

Bug: 807332
Change-Id: I346dc325f36f83a3bd20064617bd43aca9f48423
Reviewed-on: https://chromium-review.googlesource.com/895942
Commit-Queue: Gustav Sennton <gsennton@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534041}