Create Context with OutputSurface in SyncCompositor
Create GLContext when OutputSurface is created, ie at the
same time as rest of chrome platforms.
This is possible because renderer compositor context run on
chrome's gpu thread, rather than android's thread which was
not always available.
This allows the explicit initialize/release code paths to
be deleted. Delete them from android_webview and content
in this CL.
BUG=474416
Review URL: https://codereview.chromium.org/
1077783002
Cr-Commit-Position: refs/heads/master@{#324679}