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Create FakeDataSink class to retrieve request body from
UploadDataProvider. Add request body byte array as a parameter to
ResponseMatcher.getResponse(). Added ResponseMatchers should
verify the body of the request if that is necessary for the test
before responding.

Patched from original CL: crrev.com/c/1742515 (kirchman@'s internship
ended).

Bug: 669707
Change-Id: I3be8a95e80e82cf74edd7bd5e23e5adf2e5e04cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784978
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699875}