All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=871347

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=4ca56edef89679e4445fede912f00b80197cd8d2ecd2d406cf26183839facbda


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

Android Nexus5 Perf

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/1489ad58640000

📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/1489ad58640000

Enable use-zoom-for-dsf on Android on M70 by eirage@chromium.org
https://chromium.googlesource.com/chromium/src/+/d0b8bbd2dbf9c06dcbbd01a4b1285cf7a1bc2ba0
60.05 → 26.09 (-33.95)

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

 Issue 871935  has been merged into this issue.

 Issue 872604  has been merged into this issue.

 Issue 871304  has been merged into this issue.

 Issue 874418  has been merged into this issue.

 Issue 875423  has been merged into this issue.

 Issue 874871  has been merged into this issue.

 Issue 875359  has been merged into this issue.

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/145fae51640000

eirage@ this looks like a pretty large regression.  Could you please confirm if it's expected?  Marking P1, RB-B for now.

Other related graphs: https://chromeperf.appspot.com/report?sid=32cc1b277af84c8bc64e2c3b097b8e6d48c8e5e687d6be0f8ed2e9546145073b

📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/145fae51640000

Enable use-zoom-for-dsf on Android on M70 by eirage@chromium.org
https://chromium.googlesource.com/chromium/src/+/d0b8bbd2dbf9c06dcbbd01a4b1285cf7a1bc2ba0
17.75 → 23.96 (+6.211)

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

The flag is off, removing RB-B

 Issue 870168  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9bdc415d08a3e7256cda5b3504a435339454c407

commit 9bdc415d08a3e7256cda5b3504a435339454c407
Author: Ella Ge <eirage@chromium.org>
Date: Fri Sep 21 16:40:57 2018

solid color quads workaround for use-zoom-for-dsf

solid color quads used scale = 1 for non-mask layer, so when
use-zoom-for-dsf is enabled, it generates a lot more solid color
quads, which causes a bunch of rendering performance regression.

This CL makes the scale = 1 / dsf when use-zoom-for-dsf is enable,
so we generate same amount solid color quads as before.
This should not break solid color quad as it doesn't count dsf before.

Bug:  871347 
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I7f30ebf51fbd9bfe8800aa34f228b98985358c39
Reviewed-on: https://chromium-review.googlesource.com/1234362
Reviewed-by: weiliangc <weiliangc@chromium.org>
Reviewed-by: Xianda Sun <sunxd@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593221}
[modify] https://crrev.com/9bdc415d08a3e7256cda5b3504a435339454c407/cc/layers/picture_layer_impl.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d7d5990bc6b25d7b7ce711b035147030e778879a

commit d7d5990bc6b25d7b7ce711b035147030e778879a
Author: Ella Ge <eirage@chromium.org>
Date: Fri Oct 05 23:51:35 2018

Revert "solid color quads workaround for use-zoom-for-dsf"

This reverts commit 9bdc415d08a3e7256cda5b3504a435339454c407.

Reason for revert:
This workaround is causing issue such as: crbug/888440 and
the also black patch mentioned in crbug/879766#50

Original change's description:
> solid color quads workaround for use-zoom-for-dsf
>
> solid color quads used scale = 1 for non-mask layer, so when
> use-zoom-for-dsf is enabled, it generates a lot more solid color
> quads, which causes a bunch of rendering performance regression.
>
> This CL makes the scale = 1 / dsf when use-zoom-for-dsf is enable,
> so we generate same amount solid color quads as before.
> This should not break solid color quad as it doesn't count dsf before.
>
> Bug:  871347 
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: I7f30ebf51fbd9bfe8800aa34f228b98985358c39
> Reviewed-on: https://chromium-review.googlesource.com/1234362
> Reviewed-by: weiliangc <weiliangc@chromium.org>
> Reviewed-by: Xianda Sun <sunxd@chromium.org>
> Commit-Queue: Ella Ge <eirage@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#593221}

TBR=weiliangc@chromium.org,sunxd@chromium.org,eirage@chromium.org, kbr@chromium.org

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

Bug:  871347 , 888440
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;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Iaac40f237a97cc57cb91905d73b65ccb3afd5d6f
Reviewed-on: https://chromium-review.googlesource.com/c/1264740
Commit-Queue: Ella Ge <eirage@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597373}
[modify] https://crrev.com/d7d5990bc6b25d7b7ce711b035147030e778879a/cc/layers/picture_layer_impl.cc
[modify] https://crrev.com/d7d5990bc6b25d7b7ce711b035147030e778879a/content/test/gpu/gpu_tests/pixel_expectations.py
[modify] https://crrev.com/d7d5990bc6b25d7b7ce711b035147030e778879a/content/test/gpu/gpu_tests/pixel_test_pages.py