gpu: Refactor GpuMemoryBuffer framework for multi-process support.

ui/gl/gl_image_mac.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #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"
 
 namespace gfx {
 
 scoped_refptr<GLImage> GLImage::CreateGLImage(gfx::PluginWindowHandle window) {
   TRACE_EVENT0("gpu", "GLImage::CreateGLImage");
   switch (GetGLImplementation()) {
     case kGLImplementationOSMesaGL:
     case kGLImplementationDesktopGL:
     case kGLImplementationAppleGL:
       return NULL;
     case kGLImplementationMockGL:
       return new GLImageStub;
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
 scoped_refptr<GLImage> GLImage::CreateGLImageForGpuMemoryBuffer(
     gfx::GpuMemoryBufferHandle buffer, gfx::Size size) {
   TRACE_EVENT0("gpu", "GLImage::CreateGLImageForGpuMemoryBuffer");
   switch (GetGLImplementation()) {
     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:
       NOTREACHED();
       return NULL;
   }
 }
 
 }  // namespace gfx