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

chrome/browser/extensions/webstore_installer.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_WEBSTORE_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALLER_H_
 
 #include <list>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/supports_user_data.h"
+#include "base/timer/timer.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/download_interrupt_reasons.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "extensions/common/manifest_handlers/shared_module_info.h"
@@ skipping 192 matching lines @@
   // Downloads next pending module in |pending_modules_|.
   void DownloadNextPendingModule();
 
   // Downloads and installs a single Crx with the given |extension_id|.
   // This function is used for both the extension Crx and dependences.
   void DownloadCrx(const std::string& extension_id, InstallSource source);
 
   // Starts downloading the extension to |file_path|.
   void StartDownload(const base::FilePath& file_path);
 
+  // Updates the InstallTracker with the latest download progress.
+  void UpdateDownloadProgress();
+
   // Reports an install |error| to the delegate for the given extension if this
   // managed its installation. This also removes the associated PendingInstall.
   void ReportFailure(const std::string& error, FailureReason reason);
 
   // Reports a successful install to the delegate for the given extension if
   // this managed its installation. This also removes the associated
   // PendingInstall.
   void ReportSuccess();
 
   // Records stats regarding an interrupted webstore download item.
   void RecordInterrupt(const content::DownloadItem* download) const;
 
   content::NotificationRegistrar registrar_;
   Profile* profile_;
   Delegate* delegate_;
   std::string id_;
   InstallSource install_source_;
   // The DownloadItem is owned by the DownloadManager and is valid from when
   // OnDownloadStarted is called (with no error) until OnDownloadDestroyed().
   content::DownloadItem* download_item_;
+  // Used to periodically update the extension's download status. This will
+  // trigger at least every second, though sometimes more frequently (depending
+  // on number of modules, etc).
+  base::OneShotTimer<WebstoreInstaller> download_progress_timer_;
   scoped_ptr<Approval> approval_;
   GURL download_url_;
 
   // Pending modules.
   std::list<SharedModuleInfo::ImportInfo> pending_modules_;
   // Total extension modules we need download and install (the main module and
   // depedences).
   int total_modules_;
   bool download_started_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALLER_H_