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

Bug: 1054009,1057193
Change-Id: I6ece91efe32395a37c14cd4ca4c59da9f2e05da0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159894Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Mohsen Izadi <mohsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762104}