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FrameSinkManager is responsible for creating and updating the FrameSink
hierarchy to allow propagation of BeginFrames across CompositorFrameSink.
This CL removes some publicly exposed methods on FrameSinkManager that
simply forward operations along to SurfaceManager. This takes us one step
closer toward merging mojom::FrameSinkManager and viz::FrameSinkManager
together.

Bug: 722935
Change-Id: Ibb4b5b174a56e138add1ba44b32919ff9ad4ec52
Reviewed-on: https://chromium-review.googlesource.com/574878
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Bo Liu <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487295}