[win] Add a progress bar in the app launcher for app installs.

chrome/browser/extensions/api/webstore_private/webstore_private_api.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_API_WEBSTORE_PRIVATE_WEBSTORE_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_WEBSTORE_PRIVATE_WEBSTORE_PRIVATE_API_H_
 
 #include <string>
 
 #include "chrome/browser/extensions/bundle_installer.h"
@@ skipping 146 matching lines @@
                              WEBSTOREPRIVATE_COMPLETEINSTALL)
 
   CompleteInstallFunction();
 
   // WebstoreInstaller::Delegate:
   virtual void OnExtensionInstallSuccess(const std::string& id) OVERRIDE;
   virtual void OnExtensionInstallFailure(
       const std::string& id,
       const std::string& error,
       WebstoreInstaller::FailureReason reason) OVERRIDE;
+  virtual void OnExtensionDownloadProgress(
+      const std::string& id,
+      content::DownloadItem* item) OVERRIDE;
 
  protected:
   virtual ~CompleteInstallFunction();
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
 
  private:
   void AfterMaybeInstallAppLauncher(bool ok);
   void OnGetAppLauncherEnabled(std::string id, bool app_launcher_enabled);
@@ skipping 71 matching lines @@
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
 
  private:
   void OnIsLauncherCheckCompleted(bool is_enabled);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_WEBSTORE_PRIVATE_WEBSTORE_PRIVATE_API_H_