Adding Wayland support for ui/gfx

* 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: http://src.chromium.org/svn/trunk/src/build@96192 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -988,6 +988,13 @@
               ['exclude', '(^|/)(gtk|x11)_[^/]*\\.(h|cc)$'],
             ],
           }],
+          ['use_wayland!=1', {
+            'sources/': [
+              ['exclude', '_(wayland)(_unittest)?\\.(h|cc)$'],
+              ['exclude', '(^|/)wayland/'],
+              ['exclude', '(^|/)(wayland)_[^/]*\\.(h|cc)$'],
+            ],
+          }],
           ['OS!="linux"', {
             'sources/': [
               ['exclude', '_linux(_unittest)?\\.(h|cc)$'],