Refactor PPAPI proxy resource handling to maintain which host they came from,...

ppapi/proxy/ppb_audio_config_proxy.cc

Index: ppapi/proxy/ppb_audio_config_proxy.cc
===================================================================
--- ppapi/proxy/ppb_audio_config_proxy.cc	(revision 72840)
+++ ppapi/proxy/ppb_audio_config_proxy.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -14,10 +14,10 @@
 
 class AudioConfig : public PluginResource {
  public:
-  AudioConfig(PP_Instance instance,
+  AudioConfig(const HostResource& resource,
               PP_AudioSampleRate sample_rate,
               uint32_t sample_frame_count)
-      : PluginResource(instance),
+      : PluginResource(resource),
         sample_rate_(sample_rate),
         sample_frame_count_(sample_frame_count) {
   }
@@ -41,19 +41,18 @@
 PP_Resource CreateStereo16bit(PP_Instance instance,
                               PP_AudioSampleRate sample_rate,
                               uint32_t sample_frame_count) {
-  PP_Resource result = 0;
+  HostResource resource;
   PluginDispatcher::GetForInstance(instance)->Send(
       new PpapiHostMsg_PPBAudioConfig_Create(
           INTERFACE_ID_PPB_AUDIO_CONFIG, instance,
           static_cast<int32_t>(sample_rate), sample_frame_count,
-          &result));
-  if (!result)
+          &resource));
+  if (!resource.is_null())
     return 0;
 
   linked_ptr<AudioConfig> object(
-      new AudioConfig(instance, sample_rate, sample_frame_count));
-  PluginResourceTracker::GetInstance()->AddResource(result, object);
-  return result;
+      new AudioConfig(resource, sample_rate, sample_frame_count));
+  return PluginResourceTracker::GetInstance()->AddResource(object);
 }
 
 uint32_t RecommendSampleFrameCount(PP_AudioSampleRate sample_rate,
@@ -129,10 +128,11 @@
 void PPB_AudioConfig_Proxy::OnMsgCreateStereo16Bit(PP_Instance instance,
                                                    int32_t sample_rate,
                                                    uint32_t sample_frame_count,
-                                                   PP_Resource* result) {
-  *result = ppb_audio_config_target()->CreateStereo16Bit(
-      instance, static_cast<PP_AudioSampleRate>(sample_rate),
-      sample_frame_count);
+                                                   HostResource* result) {
+  result->SetHostResource(instance,
+      ppb_audio_config_target()->CreateStereo16Bit(
+          instance, static_cast<PP_AudioSampleRate>(sample_rate),
+          sample_frame_count));
 }
 
 void PPB_AudioConfig_Proxy::OnMsgRecommendSampleFrameCount(