[ RUN      ] DumpAccessibilityTreeTest.AccessibilityIframePadding
DevTools listening on ws://127.0.0.1:55824/devtools/browser/c83ed2bf-493d-4634-8002-61ced2bf67ee
[29128:6151:0125/072110.378178:WARNING:vt_video_decode_accelerator_mac.cc(177)] Failed to create VTDecompressionSession: Error Domain=NSOSStatusErrorDomain Code=-8973 "The operation couldn’t be completed. (OSStatus error -8973.)" (codecOpenErr) (-8973)
[29128:6151:0125/072110.380127:WARNING:vt_video_decode_accelerator_mac.cc(199)] Failed to create hardware VideoToolbox session
[29128:6151:0125/072110.477994:ERROR:vt_video_encode_accelerator_mac.cc(517)]  VTCompressionSessionCreate failed: -12908
[29123:7175:0125/072110.767894:INFO:dump_accessibility_browsertest_base.cc(240)] Testing: /b/swarm_slave/w/ir/content/test/data/accessibility/html/iframe-padding.html
[29123:7175:0125/072110.768059:INFO:dump_accessibility_browsertest_base.cc(242)] Expected output: /b/swarm_slave/w/ir/content/test/data/accessibility/html/iframe-padding-expected-blink.txt
../../content/browser/accessibility/dump_accessibility_browsertest_base.cc:371: Failure
Value of: is_different
  Actual: true
Expected: false
[29123:7175:0125/072111.194014:ERROR:dump_accessibility_browsertest_base.cc(396)] Diff:
* Line Expected
- ---- --------
     1 rootWebArea pageLocation=(0, 0)
     2 ++iframe pageLocation=(0, 0) pageSize=(300, 100)
     3 ++++rootWebArea pageLocation=(0, 0) pageSize=(300, 100)
     4 ++++++genericContainer pageLocation=(0, 0) pageSize=(300, 100)
     5 ++++++++button pageLocation=(25, 25) pageSize=(250, 50) name='Ordinary Button'
     6 ++iframe pageLocation=(30, 230) pageSize=(300, 100)
     7 ++++rootWebArea pageLocation=(30, 230) pageSize=(300, 100)
*    8 ++++++genericContainer pageLocation=(30, 230) pageSize=(300, 100)
     9 ++++++++button pageLocation=(55, 255) pageSize=(250, 50) name='Ordinary Button'
    10 <-- End-of-file -->
Actual
------
rootWebArea pageLocation=(0, 0)
++iframe pageLocation=(0, 0) pageSize=(300, 100)
++++rootWebArea pageLocation=(0, 0) pageSize=(300, 100)
++++++genericContainer pageLocation=(0, 0) pageSize=(300, 100)
++++++++button pageLocation=(25, 25) pageSize=(250, 50) name='Ordinary Button'
++iframe pageLocation=(30, 230) pageSize=(300, 100)
++++rootWebArea pageLocation=(30, 230) pageSize=(300, 100)
<-- End-of-file -->
[29123:7175:0125/072111.258955:INFO:dump_accessibility_browsertest_base.cc(225)] File not found: /b/swarm_slave/w/ir/content/test/data/accessibility/html/iframe-padding-expected-mac.txt
[29123:7175:0125/072111.259041:INFO:dump_accessibility_browsertest_base.cc(226)] No expectation file present, ignoring test on this platform. To run this test anyway, create /b/swarm_slave/w/ir/content/test/data/accessibility/html/iframe-padding-expected-mac.txt (it can be empty) and then run content_browsertests with the switch: --generate-accessibility-test-expectations
[29123:35335:0125/072111.334700:WARNING:discardable_shared_memory_manager.cc(436)] Some MojoDiscardableSharedMemoryManagerImpls are still alive. They will be leaked.
[  FAILED  ] DumpAccessibilityTreeTest.AccessibilityIframePadding, where TypeParam =  and GetParam() =  (1557 ms)

The test is flaky on all the platforms. Moving to dmazzoni@

Detected 11 new flakes for test/step "DumpAccessibilityTreeTest.AccessibilityIframePadding". To see the actual flakes, please visit https://chromium-try-flakes.appspot.com/all_flake_occurrences?key=ahVzfmNocm9taXVtLXRyeS1mbGFrZXNyPwsSBUZsYWtlIjREdW1wQWNjZXNzaWJpbGl0eVRyZWVUZXN0LkFjY2Vzc2liaWxpdHlJZnJhbWVQYWRkaW5nDA. This message was posted automatically by the chromium-try-flakes app. Since flakiness is ongoing, the issue was moved back into Sheriff Bug Queue (unless already there).

Detected 5 new flakes for test/step "DumpAccessibilityTreeTest.AccessibilityIframePadding". To see the actual flakes, please visit https://chromium-try-flakes.appspot.com/all_flake_occurrences?key=ahVzfmNocm9taXVtLXRyeS1mbGFrZXNyPwsSBUZsYWtlIjREdW1wQWNjZXNzaWJpbGl0eVRyZWVUZXN0LkFjY2Vzc2liaWxpdHlJZnJhbWVQYWRkaW5nDA. This message was posted automatically by the chromium-try-flakes app.

Detected 3 new flakes for test/step "DumpAccessibilityTreeTest.AccessibilityIframePadding". To see the actual flakes, please visit https://chromium-try-flakes.appspot.com/all_flake_occurrences?key=ahVzfmNocm9taXVtLXRyeS1mbGFrZXNyPwsSBUZsYWtlIjREdW1wQWNjZXNzaWJpbGl0eVRyZWVUZXN0LkFjY2Vzc2liaWxpdHlJZnJhbWVQYWRkaW5nDA. This message was posted automatically by the chromium-try-flakes app.

Disabling the test in Win, the CL is https://chromium-review.googlesource.com/c/chromium/src/+/891318.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d62a496e14718110435ff7ff4d4d571348b9bc08

commit d62a496e14718110435ff7ff4d4d571348b9bc08
Author: vitaliii <vitaliii@chromium.org>
Date: Mon Jan 29 16:07:50 2018

Disable DumpAccessibilityTreeTest.AccessibilityIframePadding on Win.

Disable DumpAccessibilityTreeTest.AccessibilityIframePadding in Win,
because it fails flakily on Win7 and Win10.

TBR=dmazzoni@chromium.org

Bug:  805998 
Change-Id: I05e798cf1249cc8d568c4ed580f0041606cfba3f
Reviewed-on: https://chromium-review.googlesource.com/891318
Commit-Queue: vitaliii <vitaliii@chromium.org>
Reviewed-by: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532447}
[modify] https://crrev.com/d62a496e14718110435ff7ff4d4d571348b9bc08/content/browser/accessibility/dump_accessibility_tree_browsertest.cc

@dmazzoni@ can you PTAL as this disable reduces test coverage?

https://chromium-review.googlesource.com/#/c/chromium/src/+/938028

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/90f0020c78656929254daa261e2cb50217cba1b1

commit 90f0020c78656929254daa261e2cb50217cba1b1
Author: Dominic Mazzoni <dmazzoni@chromium.org>
Date: Mon Feb 26 22:24:28 2018

Fix flakiness in DumpAccessibilityTreeTest.AccessibilityIframePadding

We have logic to iterate over all frames and wait for them to finish
loading, but that logic doesn't work if there are two frames with the
same url. Change the test to use frames with different urls.

Bug:  805998 
Change-Id: I4d7d514cc0d638a95b2ddf445a7dbf59f1d73cef
Tbr: aboxhall@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/938028
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539288}
[modify] https://crrev.com/90f0020c78656929254daa261e2cb50217cba1b1/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
[add] https://crrev.com/90f0020c78656929254daa261e2cb50217cba1b1/content/test/data/accessibility/html/frame/button2.html
[modify] https://crrev.com/90f0020c78656929254daa261e2cb50217cba1b1/content/test/data/accessibility/html/iframe-padding-expected-blink.txt
[modify] https://crrev.com/90f0020c78656929254daa261e2cb50217cba1b1/content/test/data/accessibility/html/iframe-padding.html

Thank you! Is this fixed now?

Just to update:

Same flaky issue observed on Linux64stable build on official.desktop.continuous.

Builder URL:
------------
https://uberchromegw.corp.google.com/i/official.desktop.continuous/builders/linux64%20stable/builds/814

Error LOG URL:
--------------
https://logs.chromium.org/v/?s=chrome%2Fbb%2Fofficial.desktop.continuous%2Flinux64_stable%2F814%2F%2B%2Frecipes%2Fsteps%2Fcontent_browsertests%2F0%2Fstdout

Thanks..!

Just to update:

DumpAccessibilityTreeTest.AccessibilityIframePadding

Same flaky issue observed on Mac 64 build on official desktop builder.

Builder URL:
------------
https://uberchromegw.corp.google.com/i/official.desktop/builders/mac64/builds/2780

Error log URL:
-------------
https://logs.chromium.org/v/?s=chrome%2Fbb%2Fofficial.desktop%2Fmac64%2F2780%2F%2B%2Frecipes%2Fsteps%2FUpload_to_test-results__browser_tests_%2F0%2Fstdout

Thanks..!