Below mentioned content_browsertests are flaky in Linux official.desktop builder.

DumpAccessibilityTreeTest.AccessibilityWindowCropsItems
DumpAccessibilityTreeTest.AccessibilityBoundsInherits 

Link to the Builder
===================
https://uberchromegw.corp.google.com/i/official.desktop/builders/linux64/builds/711

Link to the log file
====================
https://uberchromegw.corp.google.com/i/official.desktop/builders/linux64/builds/711/steps/content_browsertests/logs/stdio

Error Log
=========
DumpAccessibilityTreeTest.AccessibilityBoundsInherits (run #1):
[ RUN      ] DumpAccessibilityTreeTest.AccessibilityBoundsInherits
Xlib:  extension "RANDR" missing on display ":9".

DevTools listening on ws://127.0.0.1:34487/devtools/browser/41a2136f-f5c9-4303-933b-e8bf9f2fe05b
[8955:8955:1019/224644.026153:181337152111:INFO:dump_accessibility_browsertest_base.cc(240)] Testing: /b/c/b/linux64/src/content/test/data/accessibility/html/bounds-inherits.html
[8955:8955:1019/224644.026218:181337152165:INFO:dump_accessibility_browsertest_base.cc(242)] Expected output: /b/c/b/linux64/src/content/test/data/accessibility/html/bounds-inherits-expected-blink.txt
../../content/browser/accessibility/dump_accessibility_browsertest_base.cc:371: Failure
Value of: is_different
  Actual: true
Expected: false
[8955:8955:1019/224644.047657:181337173607:ERROR:dump_accessibility_browsertest_base.cc(396)] Diff:
* Line Expected
- ---- --------
*    1 rootWebArea size=(800, 600)
     2 ++genericContainer size=(200, 200)
     3 ++++genericContainer offscreen size=(0, 0)
     4 ++++++genericContainer offscreen size=(0, 0)
     5 <-- End-of-file -->
     6 <-- End-of-file -->

Actual
------
rootWebArea size=(796, 560)
++genericContainer size=(200, 200)
++++genericContainer offscreen size=(0, 0)
++++++genericContainer offscreen size=(0, 0)
<-- End-of-file -->
[8955:8955:1019/224644.052258:181337178206:INFO:dump_accessibility_browsertest_base.cc(225)] File not found: /b/c/b/linux64/src/content/test/data/accessibility/html/bounds-inherits-expected-auralinux.txt
[8955:8955:1019/224644.052287:181337178234:INFO:dump_accessibility_browsertest_base.cc(226)] No expectation file present, ignoring test on this platform. To run this test anyway, create /b/c/b/linux64/src/content/test/data/accessibility/html/bounds-inherits-expected-auralinux.txt (it can be empty) and then run content_browsertests with the switch: --generate-accessibility-test-expectations
[8955:8987:1019/224644.059779:181337185728:ERROR:gpu_channel_host.cc(301)] OnChannelError
[  FAILED  ] DumpAccessibilityTreeTest.AccessibilityBoundsInherits, where TypeParam =  and GetParam() =  (194 ms)

Looping to chromium//src/content/browser/accessibility/ owners for further triaging.