The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ddaa30b6f4e207985fbbb03a9c8fd738285475d1

commit ddaa30b6f4e207985fbbb03a9c8fd738285475d1
Author: liberato@chromium.org <liberato@chromium.org>
Date: Tue Apr 24 19:45:48 2018

Add UMA for DXVA PictureBufferMechanism.

To help us figure out how to prioritize the various picture buffer
types in the new D3D11VideoDecoder, this UMA records how often
each is used in the DXVA VDA.

Bug:  835972 
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I39b41000b54b932ce8cc592893bef1826f458308
Reviewed-on: https://chromium-review.googlesource.com/1024927
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553236}
[modify] https://crrev.com/ddaa30b6f4e207985fbbb03a9c8fd738285475d1/media/gpu/windows/dxva_video_decode_accelerator_win.cc
[modify] https://crrev.com/ddaa30b6f4e207985fbbb03a9c8fd738285475d1/media/gpu/windows/dxva_video_decode_accelerator_win.h
[modify] https://crrev.com/ddaa30b6f4e207985fbbb03a9c8fd738285475d1/tools/metrics/histograms/enums.xml
[modify] https://crrev.com/ddaa30b6f4e207985fbbb03a9c8fd738285475d1/tools/metrics/histograms/histograms.xml

Your change meets the bar and is auto-approved for M67. Please go ahead and merge the CL to branch 3396 manually. Please contact milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), kbleicher@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Pls merge your change to M67 branch 3396 ASAP so we can pick it up for next M67 Beta release. Thank you.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/bf2cef8b49da3721dd716b3a3e749d0deed94b80

commit bf2cef8b49da3721dd716b3a3e749d0deed94b80
Author: liberato@chromium.org <liberato@chromium.org>
Date: Thu Apr 26 05:01:45 2018

Add UMA for DXVA PictureBufferMechanism.

To help us figure out how to prioritize the various picture buffer
types in the new D3D11VideoDecoder, this UMA records how often
each is used in the DXVA VDA.

Bug:  835972 
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I39b41000b54b932ce8cc592893bef1826f458308
Reviewed-on: https://chromium-review.googlesource.com/1024927
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#553236}(cherry picked from commit ddaa30b6f4e207985fbbb03a9c8fd738285475d1)
Reviewed-on: https://chromium-review.googlesource.com/1029632
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/branch-heads/3396@{#319}
Cr-Branched-From: 9ef2aa869bc7bc0c089e255d698cca6e47d6b038-refs/heads/master@{#550428}
[modify] https://crrev.com/bf2cef8b49da3721dd716b3a3e749d0deed94b80/media/gpu/windows/dxva_video_decode_accelerator_win.cc
[modify] https://crrev.com/bf2cef8b49da3721dd716b3a3e749d0deed94b80/media/gpu/windows/dxva_video_decode_accelerator_win.h
[modify] https://crrev.com/bf2cef8b49da3721dd716b3a3e749d0deed94b80/tools/metrics/histograms/enums.xml
[modify] https://crrev.com/bf2cef8b49da3721dd716b3a3e749d0deed94b80/tools/metrics/histograms/histograms.xml