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In the current implementation, the copy request is handled by
DelegatedFrameHost::RequestCopyOfOutput, which add copy request to
the compositor frame of the browser. After this patch, the copy
request will be handled by the
CompositorFrameSinkSupport:RequestCopyOfSurface which adds the
copy request to the surface where the copy request needs to be make.

TEST: exiting test cases on copy requests should cover all the usage

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I5c0b4572a7b8ed5fce0f5ee10f5d4dd982912e0a
Reviewed-on: https://chromium-review.googlesource.com/881548Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: Yi Xu <yiyix@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534838}