Add chrome.webstore API methods to allow sites to see progress of installation

chrome/browser/extensions/install_tracker.h

 // Copyright 2013 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_INSTALL_TRACKER_H_
 #define CHROME_BROWSER_EXTENSIONS_INSTALL_TRACKER_H_
 
 #include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "chrome/browser/extensions/install_observer.h"
@@ skipping 12 matching lines @@
  public:
   InstallTracker(Profile* profile,
                  extensions::ExtensionPrefs* prefs);
   virtual ~InstallTracker();
 
   void AddObserver(InstallObserver* observer);
   void RemoveObserver(InstallObserver* observer);
 
   void OnBeginExtensionInstall(
       const InstallObserver::ExtensionInstallParams& params);
+  void OnBeginExtensionDownload(const std::string& extension_id);
   void OnDownloadProgress(const std::string& extension_id,
                           int percent_downloaded);
+  void OnBeginCrxInstall(const std::string& extension_id);
   void OnInstallFailure(const std::string& extension_id);
 
   // Overriddes for KeyedService:
   virtual void Shutdown() OVERRIDE;
 
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  private:
   void OnAppsReordered();
 
   ObserverList<InstallObserver> observers_;
   content::NotificationRegistrar registrar_;
   PrefChangeRegistrar pref_change_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(InstallTracker);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_INSTALL_TRACKER_H_