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This CL adds the possibility to inject a base::TickClock* into
CompositorFrameReporter, so its timing can be mocked by tests.
CompositorFrameReportingController and CompositorFrameReporterTest are
also updated to make use of this.

Bug: 1054009,1057193
Change-Id: I38ab3ebb92b06f5c31e1dbdc514cab29b9791cae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2160408
Commit-Queue: Mohsen Izadi <mohsen@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762122}