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* Added GL surface and context support for Wayland.
* Updated ui/gfx files to allow Wayland support
* All Wayland code is behind the use_wayland gyp flag

This CL depends on http://codereview.chromium.org/7457023

BUG=
TEST=Compiled Chrome with use_wayland disabled to verify that
the changes didn't break anything


Review URL: http://codereview.chromium.org/7467007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96192 0039d316-1c4b-4281-b951-d872f2087c98