Move GL one-off initialization code.

ui/gl/init/gl_init.gyp

Index: ui/gl/init/gl_init.gyp
diff --git a/ui/gl/init/gl_init.gyp b/ui/gl/init/gl_init.gyp
index ba65c016268742c558dbe3276cdd0a9896dd44ae..e460a1b6f7d7cf4e92922687cf83fda12300a9df 100644
--- a/ui/gl/init/gl_init.gyp
+++ b/ui/gl/init/gl_init.gyp
@@ -21,10 +21,26 @@
         'GL_INIT_IMPLEMENTATION',
       ],
       'sources': [
+        'gl_initializer.cc',
+        'gl_initializer.h',
+        'gl_initializer_android.cc',
+        'gl_initializer_mac.cc',
+        'gl_initializer_ozone.cc',
+        'gl_initializer_win.cc',
+        'gl_initializer_x11.cc',
         'gl_factory.cc',
         'gl_factory.h',
         'gl_init_export.h',
       ],
+      'conditions': [
+        ['OS=="mac"', {
+          'link_settings': {
+            'libraries': [
+              '$(SDKROOT)/System/Library/Frameworks/OpenGL.framework',
+            ],
+          },
+        }],
+      ],
     },
   ],
 }