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

ppapi/proxy/proxy_channel.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/proxy_channel.h"
 
+#include "base/logging.h"
+#include "base/process_util.h"
 #include "ipc/ipc_platform_file.h"
 #include "ipc/ipc_test_sink.h"
 
 #if defined(OS_NACL)
 #include <unistd.h>
 #endif
 
 namespace ppapi {
 namespace proxy {
 
 ProxyChannel::ProxyChannel()
     : delegate_(NULL),
+      peer_pid_(base::kNullProcessId),
       test_sink_(NULL) {
 }
 
 ProxyChannel::~ProxyChannel() {
   DVLOG(1) << "ProxyChannel::~ProxyChannel()";
 }
 
 bool ProxyChannel::InitWithChannel(Delegate* delegate,
+                                   base::ProcessId peer_pid,
                                    const IPC::ChannelHandle& channel_handle,
                                    bool is_client) {
   delegate_ = delegate;
+  peer_pid_ = peer_pid;
   IPC::Channel::Mode mode = is_client ? IPC::Channel::MODE_CLIENT
                                       : IPC::Channel::MODE_SERVER;
   channel_.reset(new IPC::SyncChannel(channel_handle, mode, this,
                                       delegate->GetIPCMessageLoop(), true,
                                       delegate->GetShutdownEvent()));
   return true;
 }
 
 void ProxyChannel::InitWithTestSink(IPC::TestSink* test_sink) {
   DCHECK(!test_sink_);
   test_sink_ = test_sink;
+#if !defined(OS_NACL)
+  peer_pid_ = base::GetCurrentProcId();
+#endif
 }
 
 void ProxyChannel::OnChannelError() {
   channel_.reset();
 }
 
 #if defined(OS_POSIX) && !defined(OS_NACL)
 int ProxyChannel::TakeRendererFD() {
   DCHECK(channel());
   return channel()->TakeClientFileDescriptor();
 }
 #endif
 
 IPC::PlatformFileForTransit ProxyChannel::ShareHandleWithRemote(
       base::PlatformFile handle,
       bool should_close_source) {
   // Channel could be closed if the plugin crashes.
   if (!channel_.get()) {
     if (should_close_source) {
 #if !defined(OS_NACL)
       base::ClosePlatformFile(handle);
 #else
       close(handle);
 #endif
     }
     return IPC::InvalidPlatformFileForTransit();
   }
-  return delegate_->ShareHandleWithRemote(handle, *channel_,
+  DCHECK(peer_pid_ != base::kNullProcessId);
+  return delegate_->ShareHandleWithRemote(handle, peer_pid_,
                                           should_close_source);
 }
 
 bool ProxyChannel::Send(IPC::Message* msg) {
   if (test_sink_)
     return test_sink_->Send(msg);
   if (channel_.get())
     return channel_->Send(msg);
 
   // Remote side crashed, drop this message.
   delete msg;
   return false;
 }
 
 }  // namespace proxy
 }  // namespace ppapi