Enable TouchInputBrowserTests with threaded compositing on mac.

Mac uses threaded compositing always, so enable these tests and disable
the non-threaded compositing flavours.

The TouchInputBrowserTest.TouchNoHandler and
TouchInputBrowserTest.TouchNoHandler tests are still failing
on mac for some reason, so leave those 2 disabled with updated comment.

Depends on: https://codereview.chromium.org/131443007/

R=ccameron
BUG=286038,346363

Review URL: https://codereview.chromium.org/148793004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253151 0039d316-1c4b-4281-b951-d872f2087c98
[Chromoting] Fix alpha order of host files.

BUG=

Review URL: https://codereview.chromium.org/166263003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253152 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253152
[Android] Expose scaling-related constants in ViewConfiguration (v2)

This is a re-landing of the original code (r252401), with a proper fallback
for devices that lack the hidden dimension constants.

BUG=345602, 332418
NOTRY=true

Review URL: https://codereview.chromium.org/178193002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253153 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253153