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Adding a class to represent the Windows RandomAccessStream class
within tests, as well as basic unit tests to validate the test class
behaviors. This class behaves similarly to the Windows equivalent,
except it includes gtest validations for expected usage and schedules
all async operations through a ThreadTaskRunner.

Bug: 1035527
Change-Id: Id0ce1af8995260fdcb0c2a06c6408819afc4dfbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2487818Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Hoch Hochkeppel <mhochk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#819254}