Mac/gpu: Don't show uninitialized surfaces while resizing plugins / composited tabs.

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 82 matching lines @@
 
   // 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 width and height of the io surface. During resizing, this is different
+  // from |width_| and |height_|.
+  int32 surface_width_;
+  int32 surface_height_;
+
   // 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.
+  // The width and height of the container.
   int32 width_;
   int32 height_;
 
   // The clip rectangle, relative to the (x_, y_) origin.
   gfx::Rect clipRect_;
 
   // The "live" OpenGL texture referring to this IOSurfaceRef. Note
   // that per the CGLTexImageIOSurface2D API we do not need to
   // explicitly update this texture's contents once created. All we
   // need to do is ensure it is re-bound before attempting to draw
@@ skipping 18 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_