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Ensures that Android WebView works with SurfaceSynchronization enabled.

For WebView, SurfaceSynchronization is nearly a no-op, as only one
surface is ever in use. This change only does two real things:
- Ensures that WebView uses RenderFrameMetadata rather than
CompositorFrameMetadata where appropriate.
- Ensures that SurfaceIds are correctly sent to the renderer for
WebView, allowing for rendering to occur.

Also removes previous disabling of WebView in tests.

Bug: 881469
Change-Id: If01ebc3be54eb90ca3aa196a464de693ad69bed5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1570136Reviewed-by: Stefan Zager <szager@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Saman Sami <samans@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652709}