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In some cases when we transit from one HardwareRenderer to another two
of them can be alive simultaneously. This is incompatible with holding
reference to CompositorFrameSinkSupport as only one can exist for
specific FrameSinkId.

This CL moves the logic of frame submission for viz from
HardwareRendererViz::OnViz to RootFrameSink to avoid problems as there
is always one RootFrameSink.

Bug: 805739
Change-Id: Ibe45227bf0e72ee4a39932345087ded448e3c506
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028732
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736555}