Updating Mac buildbots to run gcm_unit_tests

BUG=341513

Review URL: https://codereview.chromium.org/185943008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255302 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255302
Rename tools/perf/metrics/io.py to resolve naming conflicts.

BUG=349610

Review URL: https://codereview.chromium.org/178943004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255303 0039d316-1c4b-4281-b951-d872f2087c98
Disable the touch ack timeout for touch-action:none

When the touch-action for the current touch sequence is updated, also update
whether the touch ack time is disabled based on the allowed touch-action. This
provides a straightforward knob for developers to disable the timeout on desktop
sites.

BUG=340060

Review URL: https://codereview.chromium.org/183923034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255304 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255303
SVN changes up to revision 255304