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This CL factors out the compositor frame logic from FastInkView.

FastInkHost is now responsible for pusing CompositorFrame and
FastInkView is a client of the FastInkHost.

Bug: 1054474
Change-Id: I4b58aa19eb9ec902071fd38fa994ead2e6009311
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2101941
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751839}