ipc: Make a common subclass for Channel and ProxyChannel.

ipc/ipc_channel_proxy.cc

Index: ipc/ipc_channel_proxy.cc
diff --git a/ipc/ipc_channel_proxy.cc b/ipc/ipc_channel_proxy.cc
index 2398b516419ac265c523863c13ad6ca0e696ef07..5a9c3e3dd807fa2d651a51096e7ba0fea975fa0d 100644
--- a/ipc/ipc_channel_proxy.cc
+++ b/ipc/ipc_channel_proxy.cc
@@ -59,7 +59,7 @@ void ChannelProxy::Context::CreateChannel(scoped_ptr<ChannelFactory> factory) {
   channel_id_ = factory->GetName();
   channel_ = factory->BuildChannel(this);
   channel_send_thread_safe_ = channel_->IsSendThreadSafe();
-  channel_->set_attachment_broker_endpoint(attachment_broker_endpoint_);
+  channel_->SetAttachmentBrokerEndpoint(attachment_broker_endpoint_);
 }
 
 bool ChannelProxy::Context::TryFilters(const Message& message) {
@@ -489,6 +489,14 @@ void ChannelProxy::ClearIPCTaskRunner() {
   context()->ClearIPCTaskRunner();
 }
 
+base::ProcessId ChannelProxy::GetPeerPID() const {
+  return context_->peer_pid_;
+}
+
+void ChannelProxy::OnSetAttachmentBrokerEndpoint() {
+  context()->set_attachment_broker_endpoint(is_attachment_broker_endpoint());
+}
+
 #if defined(OS_POSIX) && !defined(OS_NACL_SFI)
 // See the TODO regarding lazy initialization of the channel in
 // ChannelProxy::Init().
@@ -511,10 +519,6 @@ base::ScopedFD ChannelProxy::TakeClientFileDescriptor() {
 }
 #endif
 
-void ChannelProxy::SetAttachmentBrokerEndpoint(bool is_endpoint) {
-  context()->set_attachment_broker_endpoint(is_endpoint);
-}
-
 void ChannelProxy::OnChannelInit() {
 }