Use an explicit PID for duplicating Pepper handles rather than the Channel's.

ppapi/proxy/host_dispatcher.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/host_dispatcher.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "ppapi/c/private/ppb_proxy_private.h"
 #include "ppapi/c/ppb_var.h"
@@ skipping 69 matching lines @@
 
   ppb_proxy_->SetReserveInstanceIDCallback(pp_module_, &ReserveInstanceID);
 }
 
 HostDispatcher::~HostDispatcher() {
   g_module_to_dispatcher->erase(pp_module_);
 }
 
 bool HostDispatcher::InitHostWithChannel(
     Delegate* delegate,
+    base::ProcessId peer_pid,
     const IPC::ChannelHandle& channel_handle,
     bool is_client,
     const ppapi::Preferences& preferences) {
-  if (!Dispatcher::InitWithChannel(delegate, channel_handle, is_client))
+  if (!Dispatcher::InitWithChannel(delegate, peer_pid, channel_handle,
+                                   is_client))
     return false;
   AddIOThreadMessageFilter(sync_status_.get());
 
   Send(new PpapiMsg_SetPreferences(preferences));
   return true;
 }
 
 // static
 HostDispatcher* HostDispatcher::GetForInstance(PP_Instance instance) {
   if (!g_instance_to_dispatcher)
@@ skipping 162 matching lines @@
   }
 }
 
 ScopedModuleReference::~ScopedModuleReference() {
   if (dispatcher_)
     dispatcher_->ppb_proxy()->ReleaseModule(dispatcher_->pp_module());
 }
 
 }  // namespace proxy
 }  // namespace ppapi