Let every "accelerated IO surface swapped" message have an identifier of the surface.

chrome/browser/renderer_host/accelerated_surface_container_mac.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_GPU_PLUGIN_CONTAINER_MAC_H_
 #define CHROME_BROWSER_RENDERER_HOST_GPU_PLUGIN_CONTAINER_MAC_H_
 #pragma once
 
 // The "GPU plugin" is currently implemented as a special kind of
 // NPAPI plugin to provide high-performance on-screen 3D rendering for
@@ skipping 59 matching lines @@
   // Draws this accelerated surface's contents, texture mapped onto a quad in
   // the given OpenGL context. TODO(kbr): figure out and define exactly how the
   // coordinate system will work out.
   void Draw(CGLContextObj context);
 
   // Causes the next Draw call to trigger a texture upload. Should be called any
   // time the drawing context has changed.
   void ForceTextureReload() { texture_needs_upload_ = true; }
 
   // Notifies the surface that it was painted to.
-  void set_was_painted_to() { was_painted_to_ = true; }
+  void set_was_painted_to(uint64 surface_id);
 
   // Returns if the surface should be shown.
   bool should_be_visible() const { return visible_ && was_painted_to_; }
  private:
   // The manager of this accelerated surface container.
   AcceleratedSurfaceContainerManagerMac* manager_;
 
   // Whether this accelerated surface's content is supposed to be opaque.
   bool opaque_;
 
   // The IOSurfaceRef, if any, that has been handed from the GPU
   // plugin process back to the browser process for drawing.
   // This is held as a CFTypeRef because we can't refer to the
   // IOSurfaceRef type when building on 10.5.
   base::mac::ScopedCFTypeRef<CFTypeRef> surface_;
 
+  // The id of |surface_|, or 0 if |surface_| is NULL.
+  uint64 surface_id_;
+
   // The TransportDIB which is used in pre-10.6 systems where the IOSurface
   // API is not supported.  This is a weak reference to the actual TransportDIB
   // whic is owned by the GPU process.
   scoped_ptr<TransportDIB> transport_dib_;
 
   // The width and height of the surface.
   int32 width_;
   int32 height_;
 
   // The clip rectangle, relative to the (x_, y_) origin.
@@ skipping 24 matching lines @@
   void ReleaseIOSurface();
 
   // Enqueue our texture for later deletion.
   void EnqueueTextureForDeletion();
 
   DISALLOW_COPY_AND_ASSIGN(AcceleratedSurfaceContainerMac);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_GPU_PLUGIN_CONTAINER_MAC_H_