These are consistantly failing on 10.11, 10.12, 10.13 bots:

https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8941250292474285408%2F%2B%2Fsteps%2Fbrowser_tests_on__none__GPU_on_Mac%2F0%2Flogs%2FViewIDTest.Basic%2F0

https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8941250292474285408%2F%2B%2Fsteps%2Fbrowser_tests_on__none__GPU_on_Mac%2F0%2Flogs%2FProfileWithoutMediaCacheBrowserTest.DeleteMediaCache%2F0

https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8941250292474285408%2F%2B%2Fsteps%2Fbrowser_tests_on__none__GPU_on_Mac%2F0%2Flogs%2FProfileWithoutMediaCacheBrowserTest.DeleteIsolatedAppMediaCache%2F0

blundell@: This might be related to  issue 862466 ? Can you help me triage to someone who might know what's going on? :)

It looks like https://chromium-review.googlesource.com/c/chromium/src/+/1130162 may be responsible for ProfileWithoutMediaCacheBrowserTest.DeleteMediaCache and ProfileWithoutMediaCacheBrowserTest.DeleteIsolatedAppMediaCache. Reverting. (+mmenke, FYI).

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/eb81f73d09c9efd4ff7eb181ce3ffe105d1549a8

commit eb81f73d09c9efd4ff7eb181ce3ffe105d1549a8
Author: Mike West <mkwst@chromium.org>
Date: Thu Jul 12 09:35:30 2018

Revert "Delete the media cache(s) when using a single combined HTTP cache."

This reverts commit e226149af1b3f003b5d3f59e19ee17bef7419c42.

Reason for revert: 

`ProfileWithoutMediaCacheBrowserTest.DeleteMediaCache` and `ProfileWithoutMediaCacheBrowserTest.DeleteIsolatedAppMediaCache` have been failing, apparently since they were added by this CL.

They were added here: https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.11%20Tests/28016 (which failed to actually run `browser_test`) and have been failing consistently since https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.11%20Tests/28018.


Original change's description:
> Delete the media cache(s) when using a single combined HTTP cache.
> 
> This is so that I can try increasing the media cache size in experiments
> without increasing Chrome's profile size (Except possibly for profiles
> that have never been used to play video).
> 
> Bug: 789657
> Change-Id: I45e8f8c6e346a1fa7d05b0bea3e8b001d7dc41e1
> Reviewed-on: https://chromium-review.googlesource.com/1130162
> Reviewed-by: Maks Orlovich <morlovich@chromium.org>
> Commit-Queue: Matt Menke <mmenke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#574296}

TBR=mmenke@chromium.org,morlovich@chromium.org

Change-Id: Ibc519750f00ad7e698d279af6baffe77b32d30be
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 789657,  862945 
Reviewed-on: https://chromium-review.googlesource.com/1134886
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574513}
[modify] https://crrev.com/eb81f73d09c9efd4ff7eb181ce3ffe105d1549a8/chrome/browser/profiles/profile_browsertest.cc
[modify] https://crrev.com/eb81f73d09c9efd4ff7eb181ce3ffe105d1549a8/chrome/browser/profiles/profile_impl_io_data.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8fc8ad7e2561f48248fee640b72a808f1592634a

commit 8fc8ad7e2561f48248fee640b72a808f1592634a
Author: Mike West <mkwst@chromium.org>
Date: Thu Jul 12 09:52:33 2018

Disabling ViewIDTest.Basic.

This test is consistently failing on:

* 10.11 as of https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.11%20Tests/28018
* 10.12 as of https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.12%20Tests/14366
* 10.13 as of https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.13%20Tests/4145

TBR=mkwst@chromium.org,kpaulhamus@chromium.org

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug:  862945 
Change-Id: I9156862b472f2ad993f9da7d709b75baaddc2908
Reviewed-on: https://chromium-review.googlesource.com/1134780
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574518}
[modify] https://crrev.com/8fc8ad7e2561f48248fee640b72a808f1592634a/chrome/browser/ui/cocoa/view_id_util_browsertest.mm

Hi Mike,

The crashes in Crashpad are clearly the same bug as  crbug.com/862466  (and the right people are CC'd on that bug, although none of them have responded as of this point). As you determined, the other failures are different (and it looks like you have a handle on those).