Add gfx_unittests to trybot list for mac and windows.

BUG=331829, 299841

Review URL: https://codereview.chromium.org/178153005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253820 0039d316-1c4b-4281-b951-d872f2087c98
Move WebAXObjectProxy and AccessibleController from CppBoundClass to gin::Wrappable

BUG=297480, 331301

Review URL: https://codereview.chromium.org/172263002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253821 0039d316-1c4b-4281-b951-d872f2087c98
Files.app: Add a test to open a zip file.

BUG=345058
TEST=run the test

Review URL: https://codereview.chromium.org/177843013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253822 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253822