Manual regression range:
Good Build: 51.0.2688.0
Bad Build:  51.0.2689.0

Narrow bisect
https://chromium.googlesource.com/chromium/src/+log/3174947e46175db49b0fae95863c79cac5f6ba4e..43dee10eb95216504d473681287d186569e443e0?pretty=fuller&n=30

Suspecting: 382842 ?
Kindly help to re-assign, if your changes are not cause for this issue.

Note: Issue is seen on Windows (7, 8, 10) & Linux (ubuntu 14.04 LTS)

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Adding RB label as this is a recent regression.

Gradient stops (used by a -webkit-mask-box-image in chrome://apps) scales its individual stops according to effecting zoom, making it incompatible with the way SVG is implemented (uses scaling on paint from unzoomed to zoomed coordinate systems). So fixing the latter (as in r382842) broke the former causing this bug.

A revert of r382842 and a re-think is probably the best course of action.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6529aa5b970ab274de1ff4c0475f223930babff7

commit 6529aa5b970ab274de1ff4c0475f223930babff7
Author: davve <davve@opera.com>
Date: Mon May 02 11:57:49 2016

Revert "Straighten out zoom and border-image"

This patch reverts https://codereview.chromium.org/1819083004 patchset
#3.

Fixing SVG zoom in border-image unfortunatly broke gradients
instead. There is a difference in how scale it applied for
zooming. For SVG a source rect (unzoomed) <-> destination rect
(zoomed) scale factor is computed and used for scaling. For gradients,
the source and destination rect are always the same (both zoomed). The
individual gradients stops are zoomed instead.

BUG= 607414 , 596075, 561519

Review-Url: https://codereview.chromium.org/1934953002
Cr-Commit-Position: refs/heads/master@{#390920}

[modify] https://crrev.com/6529aa5b970ab274de1ff4c0475f223930babff7/third_party/WebKit/LayoutTests/TestExpectations
[delete] https://crrev.com/5bed693d2607cf9bb51183909bc2f01be934a610/third_party/WebKit/LayoutTests/svg/css/border-image-zoomed-expected.html
[delete] https://crrev.com/5bed693d2607cf9bb51183909bc2f01be934a610/third_party/WebKit/LayoutTests/svg/css/border-image-zoomed.html
[modify] https://crrev.com/6529aa5b970ab274de1ff4c0475f223930babff7/third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/53bc01413890e228ddb330285f2993b74305722f

commit 53bc01413890e228ddb330285f2993b74305722f
Author: davve <davve@opera.com>
Date: Mon May 02 13:53:09 2016

Add test for zoomed -webkit-mask-box-image

BUG= 607414 

Review-Url: https://codereview.chromium.org/1937903002
Cr-Commit-Position: refs/heads/master@{#390935}

[add] https://crrev.com/53bc01413890e228ddb330285f2993b74305722f/third_party/WebKit/LayoutTests/fast/backgrounds/mask-box-image-zoomed-expected.html
[add] https://crrev.com/53bc01413890e228ddb330285f2993b74305722f/third_party/WebKit/LayoutTests/fast/backgrounds/mask-box-image-zoomed.html

Your change meets the bar and is auto-approved for M51 (branch: 2704)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/96c436224c8f8c681c6b441f130c3839784d746c

commit 96c436224c8f8c681c6b441f130c3839784d746c
Author: David Vest <davve@opera.com>
Date: Tue May 03 13:04:44 2016

Revert "Straighten out zoom and border-image"

This patch reverts https://codereview.chromium.org/1819083004 patchset

Fixing SVG zoom in border-image unfortunatly broke gradients
instead. There is a difference in how scale it applied for
zooming. For SVG a source rect (unzoomed) <-> destination rect
(zoomed) scale factor is computed and used for scaling. For gradients,
the source and destination rect are always the same (both zoomed). The
individual gradients stops are zoomed instead.

BUG= 607414 , 596075, 561519

Review-Url: https://codereview.chromium.org/1934953002
Cr-Commit-Position: refs/heads/master@{#390920}
(cherry picked from commit 6529aa5b970ab274de1ff4c0475f223930babff7)

Review URL: https://codereview.chromium.org/1946543002 .

Cr-Commit-Position: refs/branch-heads/2704@{#351}
Cr-Branched-From: 6e53600def8f60d8c632fadc70d7c1939ccea347-refs/heads/master@{#386251}

[modify] https://crrev.com/96c436224c8f8c681c6b441f130c3839784d746c/third_party/WebKit/LayoutTests/TestExpectations
[delete] https://crrev.com/a8de7f8d6820d42bf0a476fd3029dd0cf0ae9c36/third_party/WebKit/LayoutTests/svg/css/border-image-zoomed-expected.html
[delete] https://crrev.com/a8de7f8d6820d42bf0a476fd3029dd0cf0ae9c36/third_party/WebKit/LayoutTests/svg/css/border-image-zoomed.html
[modify] https://crrev.com/96c436224c8f8c681c6b441f130c3839784d746c/third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp

Verified the fix on Windows 7, MAC (10.11.4) & Ubuntu Trusty (14.04) for Google Chrome Beta Version - 51.0.2704.36

Screen-recording is attached.

TE-Verified Labels are added.

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