Revert of Revert of Implement software fallback for PPB_VideoDecoder.

ppapi/proxy/video_decoder_resource.h

 // Copyright (c) 2014 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 PPAPI_PROXY_VIDEO_DECODER_RESOURCE_H_
 #define PPAPI_PROXY_VIDEO_DECODER_RESOURCE_H_
 
 #include <queue>
 
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "ppapi/proxy/connection.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/shared_impl/scoped_pp_resource.h"
 #include "ppapi/thunk/ppb_video_decoder_api.h"
 
 namespace gpu {
+struct Mailbox;
 namespace gles2 {
 class GLES2Implementation;
 }
 }
 
 namespace ppapi {
 
 class PPB_Graphics3D_Shared;
 class TrackedCallback;
 
@@ skipping 68 matching lines @@
   int32_t InitializeInternal(PP_Resource graphics_context,
                              PP_VideoProfile profile,
                              PP_Bool allow_software_fallback,
                              scoped_refptr<TrackedCallback> callback,
                              bool testing);
 
   // Unsolicited reply message handlers.
   void OnPluginMsgRequestTextures(const ResourceMessageReplyParams& params,
                                   uint32_t num_textures,
                                   const PP_Size& size,
-                                  uint32_t texture_target);
+                                  uint32_t texture_target,
+                                  const std::vector<gpu::Mailbox>& mailboxes);
   void OnPluginMsgPictureReady(const ResourceMessageReplyParams& params,
                                int32_t decode_id,
                                uint32_t texture_id);
   void OnPluginMsgDismissPicture(const ResourceMessageReplyParams& params,
                                  uint32_t texture_id);
   void OnPluginMsgNotifyError(const ResourceMessageReplyParams& params,
                               int32_t error);
 
   // Reply message handlers for operations that are done in the host.
   void OnPluginMsgInitializeComplete(const ResourceMessageReplyParams& params);
@@ skipping 49 matching lines @@
   bool testing_;
   int32_t decoder_last_error_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoDecoderResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_VIDEO_DECODER_RESOURCE_H_