Rename OffscreenCanvasSurfaceManager to OffscreenCanvasCompositorFrameSinkManager

This is split from fady's cl:
https://codereview.chromium.org/2688593002/

BUG=686861, 664547

Review-Url: https://codereview.chromium.org/2737653005
Cr-Commit-Position: refs/heads/master@{#455638}
7 files changed