gpu: Add IOSurface backed GpuMemoryBuffer implementation.

content/browser/renderer_host/render_message_filter.h

Index: content/browser/renderer_host/render_message_filter.h
diff --git a/content/browser/renderer_host/render_message_filter.h b/content/browser/renderer_host/render_message_filter.h
index 526849e102209408286e1eb048a08ea0453dc64e..764bf31259bf69345bcbbbfe6fe3e664d7774901 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -30,6 +30,7 @@
 #include "ui/surface/transport_dib.h"
 
 #if defined(OS_MACOSX)
+#include "base/mac/scoped_cftyperef.h"
 #include "content/common/mac/font_loader.h"
 #endif
 
@@ -259,7 +260,9 @@ class RenderMessageFilter : public BrowserMessageFilter {
                             uint32_t data_size);
 #endif
 
-  void OnAllocateGpuMemoryBuffer(uint32 buffer_size,
+  void OnAllocateGpuMemoryBuffer(uint32 width,
+                                 uint32 height,
+                                 uint32 internalformat,
                                  gfx::GpuMemoryBufferHandle* handle);
 
   // Cached resource request dispatcher host and plugin service, guaranteed to
@@ -302,6 +305,10 @@ class RenderMessageFilter : public BrowserMessageFilter {
   media::AudioManager* audio_manager_;
   MediaInternals* media_internals_;
 
+#if defined(OS_MACOSX)
+  base::ScopedCFTypeRef<CFTypeRef> last_io_surface_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(RenderMessageFilter);
 };