All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=849348

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=6e8564f57b7f0100f2f0c0f87d5a30da63bd4e7feab6d989feba38b7651a9b8b


Bot(s) for this bug's original alert(s):

android-nexus5X
android-webview-nexus5X
chromium-rel-win10
linux-perf
win-high-dpi

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/11fd19f6240000

📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/11fd19f6240000

GPU: Remove transfer buffer autoflushing. by jdarpinian@chromium.org
https://chromium.googlesource.com/chromium/src/+/dcfaac01164977c0e9862880ba33ba6edb5639c2
391.2 → 351.8 (-39.4)

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b63225bbef75dc91b78029ad8f8b1e516934b268

commit b63225bbef75dc91b78029ad8f8b1e516934b268
Author: James Darpinian <jdarpinian@chromium.org>
Date: Wed Jun 06 19:45:58 2018

Revert "GPU: Remove transfer buffer autoflushing."

This reverts commit dcfaac01164977c0e9862880ba33ba6edb5639c2.

Reason for revert: Regressed canvas 2d performance in some MotionMark
tests. Will redo as a WebGL-specific change.

Original change's description:
> GPU: Remove transfer buffer autoflushing.
> 
> This is change #2 of 3 reducing context switching during WebGL
> rendering. On tiled rendering GPUs context switches are slow and can
> even cause multisampling artifacts. Every time the command buffer is
> flushed, a context switch is possible.
> 
> Before, the transfer buffer would flush the command buffer after an
> arbitrary number of bytes were sent. This change removes that threshold.
> Any performance benefit of early flushing is killed by the additional
> context switching.
> 
> Bug: 828363,835353
> 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: I8f71668d4b976332820d290868282d41286ab4fe
> Reviewed-on: https://chromium-review.googlesource.com/1077568
> Commit-Queue: James Darpinian <jdarpinian@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#563404}

TBR=piman@chromium.org,jdarpinian@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 828363, 835353,  849348 
Change-Id: Iba27bae33f5395333f54db4bea4e79e41cca7e31
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
Reviewed-on: https://chromium-review.googlesource.com/1087370
Commit-Queue: James Darpinian <jdarpinian@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565006}
[modify] https://crrev.com/b63225bbef75dc91b78029ad8f8b1e516934b268/gpu/command_buffer/client/implementation_base.cc
[modify] https://crrev.com/b63225bbef75dc91b78029ad8f8b1e516934b268/gpu/command_buffer/client/implementation_base.h
[modify] https://crrev.com/b63225bbef75dc91b78029ad8f8b1e516934b268/gpu/command_buffer/client/mock_transfer_buffer.cc
[modify] https://crrev.com/b63225bbef75dc91b78029ad8f8b1e516934b268/gpu/command_buffer/client/mock_transfer_buffer.h
[modify] https://crrev.com/b63225bbef75dc91b78029ad8f8b1e516934b268/gpu/command_buffer/client/transfer_buffer.cc
[modify] https://crrev.com/b63225bbef75dc91b78029ad8f8b1e516934b268/gpu/command_buffer/client/transfer_buffer.h
[modify] https://crrev.com/b63225bbef75dc91b78029ad8f8b1e516934b268/gpu/command_buffer/client/transfer_buffer_unittest.cc

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/11db8767240000

📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/11db8767240000

GPU: Grow and shrink transfer buffer by jdarpinian@chromium.org
https://chromium-review.googlesource.com/c/chromium/src/+/1105505/8
392.2 → 402.7 (+10.59)

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions