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This CL changes the ownership of base::Clock and base::TickClock from
injectee-owned to injecter-owned. Before this CL, these instances are
owned by the owner of the injectee or one of the injectees themselves.
That makes the ownership handling complex.

After this CL, the injectee of clocks never own the clock. Instead,
injecters owns a clock for testing, and a shared clock is used on the
production code.

Bug: 789079
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ic6e68a02228f1678e22569c38257e599d4d4e432
Reviewed-on: https://chromium-review.googlesource.com/937009Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542119}