[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/devtools/forwarding_agent_host.cc

 // Copyright 2014 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 "content/browser/devtools/forwarding_agent_host.h"
 
 #include "base/bind.h"
 #include "content/browser/devtools/devtools_session.h"
 #include "content/browser/devtools/protocol/inspector_handler.h"
 
@@ skipping 11 matching lines @@
 }
 
 void ForwardingAgentHost::DispatchOnClientHost(const std::string& message) {
   SendMessageToClient(session() ? session()->session_id() : 0, message);
 }
 
 void ForwardingAgentHost::ConnectionClosed() {
   HostClosed();
 }
 
-void ForwardingAgentHost::Attach() {
+void ForwardingAgentHost::AttachSession(DevToolsSession* session) {
   delegate_->Attach(this);
 }
 
-void ForwardingAgentHost::Detach() {
+void ForwardingAgentHost::DetachSession(int session_id) {
   delegate_->Detach();
 }
 
 bool ForwardingAgentHost::DispatchProtocolMessage(
+    DevToolsSession* session,
     const std::string& message) {
   delegate_->SendMessageToBackend(message);
   return true;
 }
 
 std::string ForwardingAgentHost::GetType() {
   return delegate_->GetType();
 }
 
 std::string ForwardingAgentHost::GetTitle() {
@@ skipping 18 matching lines @@
 
 void ForwardingAgentHost::Reload() {
   delegate_->Reload();
 }
 
 bool ForwardingAgentHost::Close() {
   return delegate_->Close();
 }
 
 }  // content