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Also provides BlinkPlatformWithTaskEnvironment::GetTaskEnvironment()
so that unittests can get access to it.  Previously, it was hidden
in //media/blink/run_all_unittests.cc .

Change-Id: Ib2a13045fd377d603f8b08cba9e78da76dc67099
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868838Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707511}