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

chrome/browser/ui/app_list/apps_model_builder.cc

Index: chrome/browser/ui/app_list/apps_model_builder.cc
diff --git a/chrome/browser/ui/app_list/apps_model_builder.cc b/chrome/browser/ui/app_list/apps_model_builder.cc
index 399d4c5c527732f808e1ffb23cd2f42424615787..8af3d3ee664c2719c34657495721c972066ef692 100644
--- a/chrome/browser/ui/app_list/apps_model_builder.cc
+++ b/chrome/browser/ui/app_list/apps_model_builder.cc
@@ -88,6 +88,14 @@ void AppsModelBuilder::OnBeginExtensionInstall(
   HighlightApp();
 }
 
+void AppsModelBuilder::OnDownloadProgress(const std::string& extension_id,
+                                          int percent_downloaded) {
+  int i = FindApp(extension_id);
+  if (i == -1)
+    return;
+  GetAppAt(i)->SetPercentDownloaded(percent_downloaded);
+}
+
 void AppsModelBuilder::AddApps(const ExtensionSet* extensions, Apps* apps) {
   for (ExtensionSet::const_iterator app = extensions->begin();
        app != extensions->end(); ++app) {