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When using ScopedTaskEnvironment::NowSource::MAIN_THREAD_MOCK_TIME, both
base::Time::Now() and base::TimeTicks::Now() are affected. However, this
isn't clear in the comment and there's no unit test covering it.

This CL updates the comment and added tests to cover both
base::Time::Now() and base::TimeTicks::Now().

Bug: 917527
Test: New tests added.
Change-Id: Ida9b5f334e12e0bceb9e952f97f0ee9ef01ffc45
Reviewed-on: https://chromium-review.googlesource.com/c/1450402
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628456}