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Rename OffscreenCanvas* files in content to better match what they are,
a generic embedded frame sink for the renderer. The implementation was
originally written for offscreen canvas but now has multiple uses.

This CL is just a rename of classes, files and member variables. The
main renames are as follows:

OffscreenCanvasSurfaceImpl -> EmbeddedFrameSinkImpl
OffscreenCanvasProviderImpl -> EmbeddedFrameSinkProviderImpl
OffscreenCanvasProviderImplTest -> EmbeddedFrameSinkProviderImplTest
mojom::OffscreenCanvasProvider -> mojom::EmbeddedFrameSinkProvider
mojom::OffscreenCanvasSurfaceClient -> mojom::EmbeddedFrameSinkClient

Member variables and files are renamed to match as well.

Bug: none
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I6889c94aacc91a7787606b062822e8ad9461338b
Reviewed-on: https://chromium-review.googlesource.com/1020184
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Olivia Lai <xlai@chromium.org>
Reviewed-by: Justin Novosad <junov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555490}