ozone: Disable tests that create multiple RootWindowHosts

BUG=319986

Review URL: https://codereview.chromium.org/70233017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235670 0039d316-1c4b-4281-b951-d872f2087c98
[Android WebView] Unflake AwViewportTest#testInitialScaleClobberQuirk

Make the test resilient to spurious page scale changes that
can occur after calling WebView.setInitialScale.

Also, update AwViewportTest#testNoUserScalableQuirk to wait
for page scale change events instead of page scale polling.

BUG=319353

Review URL: https://codereview.chromium.org/71203004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235671 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235671
Telemetry: make media perf tests log errors rather than timing out

BUG=318432
TEST=tools/perf/run_benchmark media.tough_media_cases (with tough_video_cases.json edited to include invalid media URLs)

Review URL: https://codereview.chromium.org/70333004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235672 0039d316-1c4b-4281-b951-d872f2087c98
Revert "Disable MediaGalleriesPlatformAppBrowserTest.MediaGalleriesCopyTo for being flaky."

This reverts commit 9afacfdd36d9e1a8669863a5f080a9f7f34c6ff9.

Better than even odds that this patch fixed the underlying issue:

https://codereview.chromium.org/57423008/

BUG=314576
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/70493002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235673 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235673