All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=811429

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=e7697bedce983d680d9f4a4dc54de4a3eb4fa8ee8d923cd0140fa2c0f33cbc1e


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

android-nexus6
android-nexus7v2
android-one
win-high-dpi

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/1498745d840000

📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/1498745d840000

Enable root layer scrolling. by skobes@chromium.org
https://chromium.googlesource.com/chromium/src/+/96f85b68747a679ea1ac4cd05d6743ae5f7142b7

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

Looking at some of the recording regressions, the difference in pixels recorded is that with RLS we have an extra composited layer that draws content (which ends up being an extra cc::Layer). See attached test.html with a corresponding layer tree dump (tree.txt).

The "LayoutView #document" graphics layer is composited is marked as draws content, but it has an empty paint record. The "Scrolling Contents Layer" is also composited and draws content, and contains the contents of the page. 

skobes@, @chrishtr, do you know if there are cases where the document layer would actually have a non-empty paint record? Is it possible that we should be marking this layer as non-drawing in RLS?

Deleted: test.html 203 bytes

test.html 203 bytes View Download

Deleted: tree.txt 4.6 KB

tree.txt 4.6 KB View Download

The "LayoutView #document" GraphicsLayer will paint content if the page has a fixed-attachment background on high DPI.  In other cases it can be marked non-drawing.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/af5900aec823afad162a0f215b03dc2459f79edb

commit af5900aec823afad162a0f215b03dc2459f79edb
Author: Steve Kobes <skobes@chromium.org>
Date: Fri Feb 23 04:45:23 2018

Mark document's main GraphicsLayer as non-drawing.

With RLS, we don't paint anything into this layer unless we have a fixed
background.  Update the SetDrawsContent logic to reflect this.

Patchset 15 contains the core logic change along with unit test updates
and a fix to compositing/overflow/composited-scroll-overlap-test.html.

The diff from patchsets 15..16 updates 2685 layout test baselines to
include "drawsContent": false in the layer tree output, and was produced
by this script: https://pastebin.com/wtcsSnL0

The diff from patchsets 16..17 updates additional baselines missed by
the script.  These were made with webkit-patch rebaseline-cl, patched
per  http://crbug.com/812784#c8 , plus some manual fixups.  The following
additional differences are observed in these baselines:

- Some paint invalidations on the main GraphicsLayer are no longer
  recorded, because the layer does not draw content.

- Some tests stuff the layer tree JSON into their DOM, so the scrolling
  contents layer's "bounds" value reflects more lines of text.

- The devtools LayerTreeModel object dumps fewer layers because it
  determines contentRoot() based on drawsContent.

- A layout invalidation on the document has a different reason code in
  timeline-paint-with-layout-invalidations.js (not fully understood).

Bug:  811429 
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_layout_ng;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: If6f4da9961c83cbf96454475ebb5727d90045238
Reviewed-on: https://chromium-review.googlesource.com/920798
Commit-Queue: Steve Kobes <skobes@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538702}
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-features=LayoutNG
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[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/layer-creation/stacking-context-overlap-nested-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/layer-creation/translatez-added-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/layer-creation/translatez-overlap-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/layer-creation/translatez-removed-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/layer-tree-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/masks/mask-layer-size-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/accelerated-overflow-scroll-should-not-affect-perspective-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/clear-scroll-parent-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/clip-descendents-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/composited-scroll-overlap-test.html
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/content-gains-scrollbars-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/content-loses-scrollbars-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/no-excessive-clip-parent-if-parent-escaped-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/overflow-auto-with-touch-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/overflow-auto-with-touch-no-overflow-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/overflow-auto-with-touch-toggle-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/overflow-hidden-with-touch-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/overflow-overlay-with-touch-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/overflow-overlay-with-touch-no-overflow-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/overflow-scroll-with-touch-no-overflow-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/overflow-scrollbar-layers-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/overflow-visible-with-touch-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/reparented-scrollbars-non-sc-anc-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/resize-painting-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/scroll-parent-absolute-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/scroll-parent-absolute-with-backdrop-filter-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/scroll-parent-with-non-stacking-context-composited-ancestor-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/scrollbar-layer-placement-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/scrolling-content-clip-to-viewport-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/overflow/universal-accelerated-overflow-scroll-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/rendering-contexts-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/rtl/rtl-absolute-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/rtl/rtl-absolute-overflow-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/rtl/rtl-absolute-overflow-scrolled-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/LayoutTests/compositing/rtl/rtl-fixed-expected.txt
[modify] https://crrev.com/af5900aec823afad162a0f215b03dc2459f79edb/third_party/WebKit/Layou

It looks like most of these graphs have a larger regression from spv175 (r537454), which may make it hard to see the improvement from r538702.

All graphs have reverted.