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Today we always write and read from the DataPipe asynchronously. This
might introduce unnecessary latency since the DataPipe might already be
readable/writable when we schedule the read/write.

This also indirectly contributes to out-of-order dispatch of Decode()
and Reset() calls in some MojoDecoderBufferConverter clients, e.g.
MojoAudioDecoderService, MojoVideoDecoderService, MojoDecryptorService.
See BUG for more details. Unit tests are added to cover this issue.

Note that this CL does not completely fix the BUG. A follow up CL will
come next, with more tests added.

BUG=792281
TEST=More tests added.

Change-Id: Ia6dc25f8621cca2a041b6299b104de2074c06a02
Reviewed-on: https://chromium-review.googlesource.com/818329
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Xiangjun Zhang <xjz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523246}