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Also fix mime types used in pipeline_integration_test.cc which should
be 10-bit.

Bug: 884898
Test: Add more tests.
Change-Id: I16c5f4fd22c219a88a94c4d8727f5d1a676c3e10
Reviewed-on: https://chromium-review.googlesource.com/c/1290519Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601679}