[DevTools] Support multiple sessions in WebDevToolsAgentImpl

third_party/WebKit/Source/web/WebDevToolsAgentImpl.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 114 matching lines @@
   // InspectorSession::Client implementation.
   void SendProtocolMessage(int session_id,
                            int call_id,
                            const String& response,
                            const String& state) override;
 
   // WebThread::TaskObserver implementation.
   void WillProcessTask() override;
   void DidProcessTask() override;
 
-  void InitializeSession(int session_id, const String& host_id, String* state);
-  void DestroySession();
+  InspectorSession* InitializeSession(int session_id,
+                                      const String& host_id,
+                                      String* state);
+  void DestroySession(int session_id);
   void DispatchMessageFromFrontend(int session_id,
                                    const String& method,
                                    const String& message);
 
   friend class WebDevToolsAgent;
   static void RunDebuggerTask(
       int session_id,
       std::unique_ptr<WebDevToolsAgent::MessageDescriptor>);
 
-  bool Attached() const { return session_.Get(); }
+  bool Attached() const { return !!sessions_.size(); }
 
   WebDevToolsAgentClient* client_;
   Member<WebLocalFrameBase> web_local_frame_impl_;
 
   Member<CoreProbeSink> probe_sink_;
   Member<InspectorResourceContentLoader> resource_content_loader_;
   Member<InspectedFrames> inspected_frames_;
   Member<InspectorResourceContainer> resource_container_;
+  Member<InspectorTraceEvents> trace_events_;
 
-  Member<InspectorPageAgent> page_agent_;
-  Member<InspectorNetworkAgent> network_agent_;
-  Member<InspectorLayerTreeAgent> layer_tree_agent_;
-  Member<InspectorTracingAgent> tracing_agent_;
-  Member<InspectorTraceEvents> trace_events_agent_;
-  Member<InspectorOverlayAgent> overlay_agent_;
+  HeapHashMap<int, Member<InspectorPageAgent>> page_agents_;
+  HeapHashMap<int, Member<InspectorNetworkAgent>> network_agents_;
+  HeapHashMap<int, Member<InspectorLayerTreeAgent>> layer_tree_agents_;
+  HeapHashMap<int, Member<InspectorTracingAgent>> tracing_agents_;
+  HeapHashMap<int, Member<InspectorOverlayAgent>> overlay_agents_;
 
-  Member<InspectorSession> session_;
+  HeapHashMap<int, Member<InspectorSession>> sessions_;
   bool include_view_agents_;
   int layer_tree_id_;
 };
 
 }  // namespace blink
 
 #endif