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This creates a (GL)SurfaceView overlay on top of the shell
container view which runs its own thread for rendering.
It calls into the native draw functor through a small
dynamic library (drawgl.so).

Committed previously: https://chromium.googlesource.com/chromium/src/+/09acbf59e7e8f1de574498ee5ba8eae0b0775438

Review URL: https://codereview.chromium.org/414503004

Cr-Commit-Position: refs/heads/master@{#292761}