gpu: Refactor GpuMemoryBuffer framework for multi-process support.

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 54cbd522907007d7fde7e0286a2e22629fd14432..b244a22ad939033083260080219e40553fe544b8 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_shm.h"
 #include "ui/gl/gl_image_stub.h"
 #include "ui/gl/gl_implementation.h"
 
@@ -32,7 +33,18 @@ scoped_refptr<GLImage> GLImage::CreateGLImageForGpuMemoryBuffer(
     case kGLImplementationOSMesaGL:
     case kGLImplementationDesktopGL:
     case kGLImplementationAppleGL:
-      return NULL;
+      switch (buffer.type) {
+        case SHARED_MEMORY_BUFFER: {
+          scoped_refptr<GLImageShm> image(new GLImageShm(size));
+          if (!image->Initialize(buffer))
+            return NULL;
+
+          return image;
+        }
+        default:
+          NOTREACHED();
+          return NULL;
+      }
     case kGLImplementationMockGL:
       return new GLImageStub;
     default: