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This is a reland of eec981f1
Original change's description:
> Add unittests for AudioOutputStream.
> 
> Previosly there were no cross-platforms tests for AudioOutputStream.
> This CL adds new tests that will run on all platforms. The tests
> are based on Windows-specific tests in media/audio/win.
> 
> Bug: 737802
> Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> Change-Id: I2accac0d7dc5e5d5ac813923ec6b83c0af6c9da6
> Reviewed-on: https://chromium-review.googlesource.com/702688
> Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
> Reviewed-by: Olga Sharonova <olka@chromium.org>
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#509522}

Bug: 737802
Change-Id: Ia3b7953437b484f37a339a90e3db9af1f315bdd9
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/809540Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522245}