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Tests the SubmitCompositorFrame IPC interface of CompositorFrameSink by
submitting a CompositorFrame constructed from a fuzzed protobuf. This
frame is embedded in a CompositorFrame displayed by a mock browser.
The CompositorFrame contains exactly one DrawQuad of the type
SolidColorDrawQuad.

This CL sets up the framework needed for further, more thorough fuzzing
of the SubmitCompositorFrame interface, and isn't expected to have
thorough coverage just yet.

R=kylechar

Bug: 923088
Change-Id: Ie6ecc0526c6e524c8e1e54e76fa32ec7dd410211
Reviewed-on: https://chromium-review.googlesource.com/c/1456864
Commit-Queue: Céline O'Neil <celineo@google.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634410}