Enhance chrome.app.window API for shelf integration with pinning support

ash/test/test_shelf_delegate.cc

Index: ash/test/test_shelf_delegate.cc
diff --git a/ash/test/test_shelf_delegate.cc b/ash/test/test_shelf_delegate.cc
index 71e9538f1757a9441763e6e41b6595e233803453..1e892e029c963f255f299edd34c1b78f7ea1f79f 100644
--- a/ash/test/test_shelf_delegate.cc
+++ b/ash/test/test_shelf_delegate.cc
@@ -105,6 +105,12 @@ ShelfID TestShelfDelegate::GetShelfIDForAppID(const std::string& app_id) {
   return 0;
 }
 
+ShelfID TestShelfDelegate::GetShelfIDForAppIDAndLaunchID(
+    const std::string& app_id,
+    const std::string& launch_id) {
+  return GetShelfIDForAppID(app_id);
+}
+
 bool TestShelfDelegate::HasShelfIDToAppIDMapping(ShelfID id) const {
   return shelf_id_to_app_id_map_.find(id) != shelf_id_to_app_id_map_.end();
 }