Update Resize information from OffscreenCanvas to OffscreenCanvasFrameDispatcher

In addition to that, this CL makes OffscreenCanvasFrameDispatcher own
FrameSinkId only, because the localFrameId will be changed in resizing
workflow.

TBR=junov@chromium.org
BUG=662498

Review-Url: https://codereview.chromium.org/2517343003
Cr-Commit-Position: refs/heads/master@{#434308}
4 files changed