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

chrome/browser/ui/app_list/app_list_view_delegate.h

Index: chrome/browser/ui/app_list/app_list_view_delegate.h
diff --git a/chrome/browser/ui/app_list/app_list_view_delegate.h b/chrome/browser/ui/app_list/app_list_view_delegate.h
index 457a7d9eee8899c4df8f1ed7acc04cdec833ca86..4bd04b4068d8c6b21ca33c6348d1a1adfc6b24be 100644
--- a/chrome/browser/ui/app_list/app_list_view_delegate.h
+++ b/chrome/browser/ui/app_list/app_list_view_delegate.h
@@ -36,6 +36,10 @@ class AppListViewDelegate : public app_list::AppListViewDelegate {
                                const std::string& extension_name,
                                const gfx::ImageSkia& installing_icon);
 
+  // Called when the download of an extension makes progress.
+  void OnDownloadProgress(const std::string& extension_id,
+                          int percent_downloaded);
+
  private:
   // Overridden from app_list::AppListViewDelegate:
   virtual void SetModel(app_list::AppListModel* model) OVERRIDE;