Fix a bug where the inspector would not keep event pages alive.

content/public/browser/devtools_manager.h

 // Copyright (c) 2012 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_PUBLIC_BROWSER_DEVTOOLS_MANAGER_H_
 #define CONTENT_PUBLIC_BROWSER_DEVTOOLS_MANAGER_H_
 
 #include <string>
 
 #include "content/common/content_export.h"
@@ skipping 50 matching lines @@
 
   // Detaches client from |from_agent| and returns a cookie that allows to
   // reattach that client to another agent later. Returns -1 if there is no
   // client attached to |from_agent|.
   virtual int DetachClientHost(DevToolsAgentHost* from_agent) = 0;
   // Reattaches client host detached with DetachClientHost method above
   // to |to_agent|.
   virtual void AttachClientHost(int client_host_cookie,
                                 DevToolsAgentHost* to_agent) = 0;
 
+  // Notification the the given client host is opening a window.
+  virtual void ClientHostOpening(DevToolsClientHost* client_host) = 0;
+
   // This method will remove all references from the manager to the
   // DevToolsClientHost and unregister all listeners related to the
   // DevToolsClientHost. Called by closing client.
   virtual void ClientHostClosing(DevToolsClientHost* client_host) = 0;
 
   // Starts inspecting element at position (x, y) in the specified page.
   virtual void InspectElement(DevToolsAgentHost* agent_host, int x, int y) = 0;
 
   // Logs given |message| on behalf of the given |agent_host|.
   virtual void AddMessageToConsole(DevToolsAgentHost* agent_host,
                                    ConsoleMessageLevel level,
                                    const std::string& message) = 0;
 
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DEVTOOLS_MANAGER_H_