defer to skia_for_chromium_defines.gypi for temporary guard defines

needs https://codereview.chromium.org/180063003/ to have landed first

R=bungeman@chromium.org

Review URL: https://codereview.chromium.org/180083002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253810 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253810
[SyncFS] Split MetadataDatabaseIndex out from MetadataDatabase

 * Add MetadataDatabaseIndex that maintains indexes of MetadataDatabase
 * Add multi_tracker_files_ and multi_backing_file_paths_ index for conflict resolution.

BUG=344769

Review URL: https://codereview.chromium.org/177353003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253811 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253811
Rename WindowShowType to WindowStateType to be less confusing name.

Let the WindowState::State impl to store & manage WindowStateType.

BUG=318325

Review URL: https://codereview.chromium.org/179393003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253812 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253812
Add gfx_unittests to linux / mac trybots.

BUG=331829

Review URL: https://codereview.chromium.org/178823004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253813 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253813