Ensure that pepper plugins honor the GPU H/W video decode blacklist and the disable-accelerated-vid…

ppapi/proxy/ppb_video_decoder_proxy.cc

 // 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.
 
 #include "ppapi/proxy/ppb_video_decoder_proxy.h"
 
 #include "base/logging.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "ppapi/proxy/enter_proxy.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
@@ skipping 174 matching lines @@
 PP_Resource PPB_VideoDecoder_Proxy::CreateProxyResource(
     PP_Instance instance,
     PP_Resource graphics_context,
     PP_VideoDecoder_Profile profile) {
   PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
   // Dispatcher is null if it cannot find the instance passed to it (i.e. if the
   // client passes in an invalid instance).
   if (!dispatcher)
     return 0;
 
+  if (!dispatcher->preferences().is_accelerated_video_decode_enabled)
+    return 0;
+
   EnterResourceNoLock<PPB_Graphics3D_API> enter_context(graphics_context,
                                                         true);
   if (enter_context.failed())
     return 0;
 
   Graphics3D* context = static_cast<Graphics3D*>(enter_context.object());
 
   HostResource result;
   dispatcher->Send(new PpapiHostMsg_PPBVideoDecoder_Create(
       API_ID_PPB_VIDEO_DECODER_DEV, instance,
@@ skipping 106 matching lines @@
 
 void PPB_VideoDecoder_Proxy::OnMsgResetACK(
     const HostResource& decoder, int32_t result) {
   EnterPluginFromHostResource<PPB_VideoDecoder_API> enter(decoder);
   if (enter.succeeded())
     static_cast<VideoDecoder*>(enter.object())->ResetACK(result);
 }
 
 }  // namespace proxy
 }  // namespace ppapi