[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/devtools/devtools_session.h

 // Copyright 2016 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/protocol/devtools_domain_handler.h"
 #include "content/browser/devtools/protocol/protocol.h"
 
 namespace content {
 
 class DevToolsAgentHostImpl;
+class DevToolsAgentHostClient;
+class RenderFrameHostImpl;
 
 class DevToolsSession : public protocol::FrontendChannel {
  public:
-  DevToolsSession(DevToolsAgentHostImpl* agent_host, int session_id);
+  DevToolsSession(DevToolsAgentHostImpl* agent_host,
+                  DevToolsAgentHostClient* client,
+                  int session_id);
   ~DevToolsSession() override;
 
-  void ResetDispatcher();
+  int session_id() const { return session_id_; }
+  void AddHandler(std::unique_ptr<protocol::DevToolsDomainHandler> handler);
+  void SetRenderFrameHost(RenderFrameHostImpl* host);
+  void SetFallThroughForNotFound(bool value);
+  protocol::DevToolsDomainHandler* GetHandlerByName(const std::string& name);
+
   protocol::Response::Status Dispatch(
       const std::string& message,
+      bool offer_to_delegate,
       int* call_id,
       std::string* method);
 
-  int session_id() { return session_id_; }
-  protocol::UberDispatcher* dispatcher() { return dispatcher_.get(); }
+  // Only used by DevToolsAgentHostImpl.
+  DevToolsAgentHostClient* client() const { return client_; }
 
  private:
   // protocol::FrontendChannel implementation.
   void sendProtocolResponse(
       int call_id,
       std::unique_ptr<protocol::Serializable> message) override;
   void sendProtocolNotification(
       std::unique_ptr<protocol::Serializable> message) override;
   void flushProtocolNotifications() override;
 
   DevToolsAgentHostImpl* agent_host_;
+  DevToolsAgentHostClient* client_;
   int session_id_;
+  std::unordered_map<std::string,
+      std::unique_ptr<protocol::DevToolsDomainHandler>> handlers_;
+  RenderFrameHostImpl* host_;
   std::unique_ptr<protocol::UberDispatcher> dispatcher_;
 };
 
 }  // namespace content