[Manifest] Add metrics recording.

chrome/browser/android/shortcut_helper.cc

Index: chrome/browser/android/shortcut_helper.cc
diff --git a/chrome/browser/android/shortcut_helper.cc b/chrome/browser/android/shortcut_helper.cc
index 339e26ffd0582c4c49f7267e176150cbfc66650a..ae602686b01bba18611beff2846595a34cecbd0a 100644
--- a/chrome/browser/android/shortcut_helper.cc
+++ b/chrome/browser/android/shortcut_helper.cc
@@ -231,6 +231,11 @@ GURL ShortcutHelper::FindBestMatchingIcon(
 }
 
 void ShortcutHelper::OnDidGetManifest(const content::Manifest& manifest) {
+  if (!manifest.IsEmpty()) {
+      content::RecordAction(
+          base::UserMetricsAction("webapps.AddShortcut.Manifest"));
+  }
+
   // Set the title based on the manifest value, if any.
   if (!manifest.short_name.is_null())
     title_ = manifest.short_name.string();