gpu: Add IOSurface backed GpuMemoryBuffer implementation.

ui/gl/gl_image_mac.cc

Index: ui/gl/gl_image_mac.cc
diff --git a/ui/gl/gl_image_mac.cc b/ui/gl/gl_image_mac.cc
index 04dc61e870bd640a0b29b7614970e41e0fd0a29d..a48047fb1b9d5e34a0d802e2e245ebe1e230f0f4 100644
--- a/ui/gl/gl_image_mac.cc
+++ b/ui/gl/gl_image_mac.cc
@@ -5,6 +5,7 @@
 #include "ui/gl/gl_image.h"
 
 #include "base/debug/trace_event.h"
+#include "ui/gl/gl_image_io_surface.h"
 #include "ui/gl/gl_image_shm.h"
 #include "ui/gl/gl_image_stub.h"
 #include "ui/gl/gl_implementation.h"
@@ -44,6 +45,13 @@ scoped_refptr<GLImage> GLImage::CreateGLImageForGpuMemoryBuffer(
 
           return image;
         }
+        case IO_SURFACE_BUFFER: {
+          scoped_refptr<GLImageIOSurface> image(new GLImageIOSurface(size));
+          if (!image->Initialize(buffer))
+            return NULL;
+
+          return image;
+        }
         default:
           NOTREACHED();
           return NULL;