Fix bug where transient pages would miss events dispatched while it was

chrome/browser/extensions/extension_host.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 171 matching lines @@
   void Close();
 
   // Const version of below function.
   const Browser* GetBrowser() const;
 
   // ExtensionFunctionDispatcher::Delegate
   virtual Browser* GetBrowser() OVERRIDE;
 
   // Message handlers.
   void OnRequest(const ExtensionHostMsg_Request_Params& params);
+  void OnEventAck();
+  void OnIncrementLazyKeepaliveCount();
+  void OnDecrementLazyKeepaliveCount();
 
   // Handles keyboard events that were not handled by HandleKeyboardEvent().
   // Platform specific implementation may override this method to handle the
   // event in platform specific way.
   virtual void UnhandledKeyboardEvent(const NativeWebKeyboardEvent& event) {}
 
   // Returns true if we're hosting a background page.
   // This isn't valid until CreateRenderView is called.
   bool is_background_page() const { return !view(); }
 
@@ skipping 44 matching lines @@
   // The relevant WebContents associated with this ExtensionHost, if any.
   content::WebContents* associated_web_contents_;
 
   // Used to measure how long it's been since the host was created.
   PerfTimer since_created_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_