[DevTools] Support multiple clients in DevToolsAgentHost

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.
 
 #ifndef CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_SESSION_H_
 #define CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_SESSION_H_
 
 #include "base/containers/flat_map.h"
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
@@ skipping 26 matching lines @@
 
   // Only used by DevToolsAgentHostImpl.
   DevToolsAgentHostClient* client() const { return client_; }
   void SendMessageToClient(const std::string& message);
 
   template <typename Handler>
   static std::vector<Handler*> HandlersForAgentHost(
       DevToolsAgentHostImpl* agent_host,
       const std::string& name) {
     std::vector<Handler*> result;
-    if (agent_host->sessions_.empty())
+    if (agent_host->sessions().empty())
       return result;
-    for (const auto& session : agent_host->sessions_) {
-      auto it = session->handlers_.find(name);
-      if (it != session->handlers_.end())
-        result.push_back(static_cast<Handler*>(it->second.get()));
+    for (auto& it_session : agent_host->sessions()) {
+      DevToolsSession* session = it_session.second;
+      auto it_handler = session->handlers_.find(name);
+      if (it_handler != session->handlers_.end())
+        result.push_back(static_cast<Handler*>(it_handler->second.get()));
     }
     return result;
   }
 
  private:
   void sendResponse(std::unique_ptr<base::DictionaryValue> response);
   // 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_;
   base::flat_map<std::string, std::unique_ptr<protocol::DevToolsDomainHandler>>
       handlers_;
   RenderFrameHostImpl* host_;
   std::unique_ptr<protocol::UberDispatcher> dispatcher_;
 
   base::WeakPtrFactory<DevToolsSession> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_SESSION_H_