Pepper takes ownership of a mailbox before passing it to the texture layer.

content/renderer/pepper/pepper_plugin_instance_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 183 matching lines @@
 
   // Schedules a scroll of the plugin.  This uses optimized scrolling only for
   // full-frame plugins, as otherwise there could be other elements on top.  The
   // slow path can also be triggered if there is an overlapping frame.
   void ScrollRect(int dx, int dy, const gfx::Rect& rect);
 
   // Commit the backing texture to the screen once the side effects some
   // rendering up to an offscreen SwapBuffers are visible.
   void CommitBackingTexture();
 
+  // Takes ownership of the front buffer of |bound_graphics_3d_| and passes it
+  // to |texture_layer_|.
+  void PassTextureFromGraphics3DToTextureLayer();
+
   // Called when the out-of-process plugin implementing this instance crashed.
   void InstanceCrashed();
 
   // PPB_Instance and PPB_Instance_Private implementation.
   bool full_frame() const { return full_frame_; }
   const ppapi::ViewData& view_data() const { return view_data_; }
 
   // PPP_Instance and PPP_Instance_Private.
   bool Initialize(const std::vector<std::string>& arg_names,
                   const std::vector<std::string>& arg_values,
@@ skipping 728 matching lines @@
   // view change events.
   base::WeakPtrFactory<PepperPluginInstanceImpl> view_change_weak_ptr_factory_;
   base::WeakPtrFactory<PepperPluginInstanceImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperPluginInstanceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_