Using the per-revision bisect providing the bisect results,
Good Build -- 58.0.3009.0 (revision : 449802)
Bad Build  -- 58.0.3011.0 (revision : 450199)

You are probably looking for a change made after 449898 (known good), but no later than 449899 (first known bad).
CHANGELOG URL:
  https://chromium.googlesource.com/chromium/src/+log/09885722cd8637e59680a1996bac98454cad4bf7..56850c99e856e368af5f440d75d8e8bdb13608f1

@chirshtr -- Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Thank You.

 Issue 691960  has been merged into this issue.

With the GeometryMapper code path, the background rect for 
DIV class='wave' is ,0 39.5x39.5 instead of 0,0 40x40. It appears
there is either a rounding or subpixel issue. Digging
further.

The problem is incorrect pixel-snapping in PaintPropertyTreebuilder::updateOverflowClip.

 Issue 691963  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/19b6d116165378bc06ae204d74b5b1da58caa9ab

commit 19b6d116165378bc06ae204d74b5b1da58caa9ab
Author: chrishtr <chrishtr@chromium.org>
Date: Fri Feb 17 02:28:24 2017

Don't pixel-snap overflow clips in clip paint property nodes.

Pixel-snapping should be applied at "paint" time instead, based on context
which includes subpixel accumulation.

Also, adds code to apply subpixel accumulation for overflow clip rects applied
to background clip rects.

BUG= 691959 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2701523003
Cr-Commit-Position: refs/heads/master@{#451189}

[modify] https://crrev.com/19b6d116165378bc06ae204d74b5b1da58caa9ab/third_party/WebKit/LayoutTests/TestExpectations
[modify] https://crrev.com/19b6d116165378bc06ae204d74b5b1da58caa9ab/third_party/WebKit/Source/core/paint/PaintLayerClipper.cpp
[modify] https://crrev.com/19b6d116165378bc06ae204d74b5b1da58caa9ab/third_party/WebKit/Source/core/paint/PaintLayerClipperTest.cpp
[modify] https://crrev.com/19b6d116165378bc06ae204d74b5b1da58caa9ab/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
[modify] https://crrev.com/19b6d116165378bc06ae204d74b5b1da58caa9ab/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/029bc0cf9e019f9c3c1281e89a1970ca57fe62f9

commit 029bc0cf9e019f9c3c1281e89a1970ca57fe62f9
Author: Rebaseline Bot <blink-rebaseline-bot@chromium.org>
Date: Fri Feb 17 03:49:43 2017

Auto-rebaseline for r451189

Build: https://build.chromium.org/p/chromium.infra.cron/builders/rebaseline-o-matic/builds/607307

https://chromium.googlesource.com/chromium/src/+/19b6d11616537

BUG= 691959 
TBR=chrishtr@chromium.org

Review-Url: https://codereview.chromium.org/2706483002 .
Cr-Commit-Position: refs/heads/master@{#451203}

[modify] https://crrev.com/029bc0cf9e019f9c3c1281e89a1970ca57fe62f9/third_party/WebKit/LayoutTests/TestExpectations
[modify] https://crrev.com/029bc0cf9e019f9c3c1281e89a1970ca57fe62f9/third_party/WebKit/LayoutTests/platform/mac-mac10.10/paint/invalidation/control-clip-expected.txt
[modify] https://crrev.com/029bc0cf9e019f9c3c1281e89a1970ca57fe62f9/third_party/WebKit/LayoutTests/platform/mac-mac10.9/paint/invalidation/control-clip-expected.txt
[modify] https://crrev.com/029bc0cf9e019f9c3c1281e89a1970ca57fe62f9/third_party/WebKit/LayoutTests/platform/mac/paint/invalidation/control-clip-expected.txt

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6bb957fdd7376485034caeeaad8bc3d3413aa23c

commit 6bb957fdd7376485034caeeaad8bc3d3413aa23c
Author: wangxianzhu <wangxianzhu@chromium.org>
Date: Fri Feb 17 04:13:14 2017

Rebaseline paint/invalidation/select-option-background-color.html on Mac

BUG= 691959 
TBR=mgiuca@chromium.org
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2694623015
Cr-Commit-Position: refs/heads/master@{#451205}

[delete] https://crrev.com/4f5cea4f7970a0e79f88c94959126187ef0be744/third_party/WebKit/LayoutTests/platform/mac-mac10.10/paint/invalidation/select-option-background-color-expected.txt
[modify] https://crrev.com/6bb957fdd7376485034caeeaad8bc3d3413aa23c/third_party/WebKit/LayoutTests/platform/mac/paint/invalidation/select-option-background-color-expected.txt

 Issue 693394  has been merged into this issue.

Verified this issue on Windows 10, Mac 10.12.3 and Ubuntu 14.04 with chrome dev #58.0.3018.0

Didn't observe any chopping on grey focus, attached the screen-cast for reference.

Hence Adding TE-Verified labels.

Deleted: Issue 691959.png 78.1 KB

	Issue 691959.png 78.1 KB View Download