Assigning to wangxianzhu for further triaging.

Sample log:

Regressions: Unexpected image and text failures (4)
  svg/carto.net/tabgroup.svg [ Failure ]
  svg/custom/js-late-clipPath-and-object-creation.svg [ Failure ]
  svg/custom/js-late-gradient-and-object-creation.svg [ Failure ]
  svg/custom/js-late-pattern-and-object-creation.svg [ Failure ]

This might be caused by  bug 620126  and  bug 637078  which are the source of the flakiness. The rebaseline bot happened to pick up the wrong results. Will rebaseline again.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0da7af003aaaecec37a82618290aaae3ff8202ad

commit 0da7af003aaaecec37a82618290aaae3ff8202ad
Author: guidou <guidou@chromium.org>
Date: Thu Aug 18 15:47:29 2016

Mark some svg layout tests as flaky.

  svg/carto.net/tabgroup.svg
  svg/custom/js-late-clipPath-and-object-creation.svg
  svg/custom/js-late-gradient-and-object-creation.svg
  svg/custom/js-late-pattern-and-object-creation.svg

TBR=wangxianzhu@chromium.org
BUG= 638931 

Review-Url: https://codereview.chromium.org/2258583005
Cr-Commit-Position: refs/heads/master@{#412843}

[modify] https://crrev.com/0da7af003aaaecec37a82618290aaae3ff8202ad/third_party/WebKit/LayoutTests/TestExpectations

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6d550464866eeb4c1a1b0bfb822ad5532623320d

commit 6d550464866eeb4c1a1b0bfb822ad5532623320d
Author: wangxianzhu <wangxianzhu@chromium.org>
Date: Thu Aug 18 17:16:57 2016

Rebaseline several svg tests after wrong rebaseline

BUG= 638931 
TBR=guidou@chromium.org

Review-Url: https://codereview.chromium.org/2253313003
Cr-Commit-Position: refs/heads/master@{#412866}

[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/TestExpectations
[delete] https://crrev.com/c81e0cce848adda65b4e78b1a6a51e6670296e5f/third_party/WebKit/LayoutTests/platform/android/svg/custom/js-late-clipPath-and-object-creation-expected.png
[delete] https://crrev.com/c81e0cce848adda65b4e78b1a6a51e6670296e5f/third_party/WebKit/LayoutTests/platform/linux-precise/svg/carto.net/tabgroup-expected.png
[delete] https://crrev.com/c81e0cce848adda65b4e78b1a6a51e6670296e5f/third_party/WebKit/LayoutTests/platform/linux-precise/svg/carto.net/tabgroup-expected.txt
[delete] https://crrev.com/c81e0cce848adda65b4e78b1a6a51e6670296e5f/third_party/WebKit/LayoutTests/platform/linux-precise/svg/custom/js-late-clipPath-and-object-creation-expected.png
[delete] https://crrev.com/c81e0cce848adda65b4e78b1a6a51e6670296e5f/third_party/WebKit/LayoutTests/platform/linux-precise/svg/custom/js-late-gradient-and-object-creation-expected.png
[delete] https://crrev.com/c81e0cce848adda65b4e78b1a6a51e6670296e5f/third_party/WebKit/LayoutTests/platform/linux-precise/svg/custom/js-late-pattern-and-object-creation-expected.png
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/linux/svg/carto.net/tabgroup-expected.png
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/linux/svg/carto.net/tabgroup-expected.txt
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/linux/svg/custom/js-late-clipPath-and-object-creation-expected.png
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/linux/svg/custom/js-late-clipPath-and-object-creation-expected.txt
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/linux/svg/custom/js-late-gradient-and-object-creation-expected.png
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/linux/svg/custom/js-late-gradient-and-object-creation-expected.txt
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/linux/svg/custom/js-late-pattern-and-object-creation-expected.png
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/linux/svg/custom/js-late-pattern-and-object-creation-expected.txt
[add] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-mac10.10/svg/custom/js-late-clipPath-and-object-creation-expected.png
[rename] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-mac10.10/svg/custom/js-late-clipPath-and-object-creation-expected.txt
[add] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-mac10.10/svg/custom/js-late-gradient-and-object-creation-expected.png
[rename] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-mac10.10/svg/custom/js-late-gradient-and-object-creation-expected.txt
[add] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-mac10.10/svg/custom/js-late-pattern-and-object-creation-expected.png
[rename] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-mac10.10/svg/custom/js-late-pattern-and-object-creation-expected.txt
[add] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-retina/svg/custom/js-late-clipPath-and-object-creation-expected.png
[copy] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-retina/svg/custom/js-late-clipPath-and-object-creation-expected.txt
[add] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-retina/svg/custom/js-late-gradient-and-object-creation-expected.png
[copy] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-retina/svg/custom/js-late-gradient-and-object-creation-expected.txt
[add] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-retina/svg/custom/js-late-pattern-and-object-creation-expected.png
[copy] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac-retina/svg/custom/js-late-pattern-and-object-creation-expected.txt
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac/svg/custom/js-late-clipPath-and-object-creation-expected.png
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac/svg/custom/js-late-clipPath-and-object-creation-expected.txt
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac/svg/custom/js-late-gradient-and-object-creation-expected.png
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac/svg/custom/js-late-gradient-and-object-creation-expected.txt
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac/svg/custom/js-late-pattern-and-object-creation-expected.png
[modify] https://crrev.com/6d550464866eeb4c1a1b0bfb822ad5532623320d/third_party/WebKit/LayoutTests/platform/mac/svg/custom/js-late-pattern-and-object-creation-expected.txt

Looks like these three tests are still failing consistently on WebKit Mac10.11 after the rebaseline:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.11
For example: https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.11/builds/8750

I'll disable them for Mac for now to get that bot green again.

For #7, the affected tests are:
svg/custom/js-late-gradient-and-object-creation.svg
svg/custom/js-late-clipPath-and-object-creation.svg
svg/custom/js-late-pattern-and-object-creation.svg

The svg/carto.net/tabgroup.svg from the original report seems to be fine.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ad96cd149cce71f626e0d2b614a94c5dc63cd149

commit ad96cd149cce71f626e0d2b614a94c5dc63cd149
Author: alexmos <alexmos@chromium.org>
Date: Thu Aug 18 22:38:41 2016

Mark three svg tests as flaky for Mac 10.11

BUG= 638931 
NOTRY=true
TBR=wangxianzhu@chromium.org

Review-Url: https://codereview.chromium.org/2255393002
Cr-Commit-Position: refs/heads/master@{#412959}

[modify] https://crrev.com/ad96cd149cce71f626e0d2b614a94c5dc63cd149/third_party/WebKit/LayoutTests/TestExpectations

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cb38b2fb3d28b76924bf90ce98ce543b43f05e45

commit cb38b2fb3d28b76924bf90ce98ce543b43f05e45
Author: wangxianzhu <wangxianzhu@chromium.org>
Date: Tue Aug 23 18:52:48 2016

Rebaseline for  bug 638850 ,  638931 ,  638152  (flakiness caused by  bug 620126 )

BUG= 638850 , 638931 , 638152 , 620126 
TBR=wangxianzhu@chromium.org

Review-Url: https://codereview.chromium.org/2274633002
Cr-Commit-Position: refs/heads/master@{#413797}

[modify] https://crrev.com/cb38b2fb3d28b76924bf90ce98ce543b43f05e45/third_party/WebKit/LayoutTests/TestExpectations
[delete] https://crrev.com/49a0d443aad757be9766762fb8b7bd1bc26bf58e/third_party/WebKit/LayoutTests/platform/linux-precise/fast/inline-block/14498-positionForCoordinates-expected.png
[delete] https://crrev.com/49a0d443aad757be9766762fb8b7bd1bc26bf58e/third_party/WebKit/LayoutTests/platform/linux-precise/fast/inline-block/14498-positionForCoordinates-expected.txt
[delete] https://crrev.com/49a0d443aad757be9766762fb8b7bd1bc26bf58e/third_party/WebKit/LayoutTests/platform/mac-mac10.10/svg/custom/js-late-clipPath-and-object-creation-expected.png
[delete] https://crrev.com/49a0d443aad757be9766762fb8b7bd1bc26bf58e/third_party/WebKit/LayoutTests/platform/mac-mac10.10/svg/custom/js-late-clipPath-and-object-creation-expected.txt
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