PPAPI: Make GetProxiedInterface not re-enter the plugin

content/renderer/pepper/ppb_video_decoder_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_PPB_VIDEO_DECODER_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PPB_VIDEO_DECODER_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
@@ skipping 40 matching lines @@
   void NotifyFlushDone() override;
   void NotifyEndOfBitstreamBuffer(int32 buffer_id) override;
   void NotifyResetDone() override;
 
  private:
   ~PPB_VideoDecoder_Impl() override;
 
   explicit PPB_VideoDecoder_Impl(PP_Instance instance);
   bool Init(PP_Resource graphics_context,
             PP_VideoDecoder_Profile profile);
+  // Returns the associated PPP_VideoDecoder_Dev interface to use when
+  // making calls on the plugin. This fetches the interface lazily. For
+  // out-of-process plugins, this means a synchronous message to the plugin,
+  // so it's important to never call this in response to a synchronous
+  // plugin->renderer message (such as the Create message).
+  const PPP_VideoDecoder_Dev* GetPPP();
 
   // This is NULL before initialization, and after destruction.
   // Holds a GpuVideoDecodeAcceleratorHost.
   scoped_ptr<media::VideoDecodeAccelerator> decoder_;
 
-  // Reference to the plugin requesting this interface.
+  // The interface to use when making calls on the plugin. For the most part,
+  // methods should not use this directly but should call GetPPP() instead.
   const PPP_VideoDecoder_Dev* ppp_videodecoder_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_VideoDecoder_Impl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PPB_VIDEO_DECODER_IMPL_H_