Add a histogram for tracking web store promo

chrome/browser/dom_ui/app_launcher_handler.h

 // Copyright (c) 2010 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_DOM_UI_APP_LAUNCHER_HANDLER_H_
 #define CHROME_BROWSER_DOM_UI_APP_LAUNCHER_HANDLER_H_
 #pragma once
 
 #include "base/scoped_ptr.h"
 #include "chrome/browser/dom_ui/dom_ui.h"
@@ skipping 46 matching lines @@
 
   // Callback for the "setLaunchType" message.
   void HandleSetLaunchType(const ListValue* args);
 
   // Callback for the "uninstallApp" message.
   void HandleUninstallApp(const ListValue* args);
 
   // Callback for the "hideAppPromo" message.
   void HandleHideAppsPromo(const ListValue* args);
 
+  // Callback for the "recordWebStoreLaunch" message.
+  void HandleRecordWebStoreLaunch(const ListValue* args);
+
+  // Callback for the "recordAppLaunch" message.
+  void HandleRecordAppLaunch(const ListValue* args);
  private:
   // ExtensionInstallUI::Delegate implementation, used for receiving
   // notification about uninstall confirmation dialog selections.
   virtual void InstallUIProceed();
   virtual void InstallUIAbort();
 
   // Returns the ExtensionInstallUI object for this class, creating it if
   // needed.
   ExtensionInstallUI* GetExtensionInstallUI();
 
@@ skipping 10 matching lines @@
   // Monitor extension preference changes so that the DOM UI can be notified.
   PrefChangeRegistrar pref_change_registrar_;
 
   // Used to show confirmation UI for uninstalling/enabling extensions in
   // incognito mode.
   scoped_ptr<ExtensionInstallUI> install_ui_;
 
   // The id of the extension we are prompting the user about.
   std::string extension_id_prompting_;
 
+  // Whether the promo is currently being shown
+  bool promo_active_;
+
   DISALLOW_COPY_AND_ASSIGN(AppLauncherHandler);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_APP_LAUNCHER_HANDLER_H_