Fix handling of Mac accelerated plugin layers across tab switch.

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_
 
 // The "GPU plugin" is currently implemented as a special kind of
 // NPAPI plugin to provide high-performance on-screen 3D rendering for
 // Pepper 3D.
@@ skipping 49 matching lines @@
 
   // Tells the accelerated surface container that it has moved relative to the
   // origin of the window, for example because of a scroll event.
   void MoveTo(const webkit_glue::WebPluginGeometry& geom);
 
   // 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; }
+
   // Enqueue our texture for later deletion. Call this before deleting
   // this object.
   void EnqueueTextureForDeletion(
       AcceleratedSurfaceContainerManagerMac* manager);
 
  private:
   // The x and y coordinates of the plugin window on the web page.
   int x_;
   int y_;
 
@@ skipping 17 matching lines @@
   // 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
   // with it.
   GLuint texture_;
 
+  // True if we need to upload the texture again during the next draw.
+  bool texture_needs_upload_;
+
   DISALLOW_COPY_AND_ASSIGN(AcceleratedSurfaceContainerMac);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_GPU_PLUGIN_CONTAINER_MAC_H_