This should be higher priority, since it causes CQ to retry jobs.
https://build.chromium.org/p/tryserver.chromium.android/builders/linux_android_rel_ng/builds/429327

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/94850fa8d7dff1246d965cb19cc24864e13ddc94

commit 94850fa8d7dff1246d965cb19cc24864e13ddc94
Author: Tommy Nyquist <nyquist@chromium.org>
Date: Fri Nov 17 00:34:32 2017

Disable flaky test ThumbnailDiskStorageTest#testRemoveAllThumbnailsWithSameContentId

TBR=qinmin@chromium.org
BUG=778829
NOTRY=true

Change-Id: I7f95b097012f6bb5b46458c43e71edf4a5861c8c
Reviewed-on: https://chromium-review.googlesource.com/776127
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517227}
[modify] https://crrev.com/94850fa8d7dff1246d965cb19cc24864e13ddc94/chrome/android/javatests/src/org/chromium/chrome/browser/widget/ThumbnailDiskStorageTest.java

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/29467520e7850fac4ab73de2be0f9557e6aa9085

commit 29467520e7850fac4ab73de2be0f9557e6aa9085
Author: Min Qin <qinmin@chromium.org>
Date: Mon Nov 27 21:15:09 2017

Fix flaky ThumbnailDiskStorageTest

When these tests start, there could be some files in the disk cache.
The tests did call mTestThumbnailDiskStorage.clear() in setUp().
However, they did not clear the removeCount value.
As a result, tests can fail if the removeCount is not initiazed to 0.

BUG=786212,778829

Change-Id: I0f797b019ed5e0cb3b6148da9b79d9679c125a43
Reviewed-on: https://chromium-review.googlesource.com/783494
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519405}
[modify] https://crrev.com/29467520e7850fac4ab73de2be0f9557e6aa9085/chrome/android/javatests/src/org/chromium/chrome/browser/widget/ThumbnailDiskStorageTest.java