Makes the maximize/restore button handling

chrome/browser/ui/views/ash/launcher/chrome_launcher_delegate.cc

Index: chrome/browser/ui/views/ash/launcher/chrome_launcher_delegate.cc
diff --git a/chrome/browser/ui/views/ash/launcher/chrome_launcher_delegate.cc b/chrome/browser/ui/views/ash/launcher/chrome_launcher_delegate.cc
index 6df9884e3f8f00235421ae2746005cedae026f95..6ffd993558055b3785b0f53e53c081b92ed8ad71 100644
--- a/chrome/browser/ui/views/ash/launcher/chrome_launcher_delegate.cc
+++ b/chrome/browser/ui/views/ash/launcher/chrome_launcher_delegate.cc
@@ -434,6 +434,16 @@ ui::MenuModel* ChromeLauncherDelegate::CreateContextMenu(
   return new LauncherContextMenu(this, item.id);
 }
 
+ash::LauncherID ChromeLauncherDelegate::GetIDByWindow(
+    aura::Window* window) {
+  for (IDToItemMap::const_iterator i = id_to_item_map_.begin();
+       i != id_to_item_map_.end(); ++i) {
+    if (i->second.updater && i->second.updater->window() == window)
+      return i->first;
+  }
+  return 0;
+}
+
 void ChromeLauncherDelegate::LauncherItemAdded(int index) {
 }