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The ability to filter out tests is vitally important when diagnosing
regressions or otherwise attempting to root out the cause of
performance degradations. Support wasn't present for the gtest_filter
flag beforehand, so this CL adds it, as well as updating the relevant
documentation.

Bug: 839491
Change-Id: I5ebb098f247b2c26d667fcfb3c699b5c27791a09
Reviewed-on: https://chromium-review.googlesource.com/1179061
Commit-Queue: Stephan Stross <stephanstross@google.com>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584102}