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

ash/test/test_shelf_delegate.h

Index: ash/test/test_shelf_delegate.h
diff --git a/ash/test/test_shelf_delegate.h b/ash/test/test_shelf_delegate.h
index 0e51e96a1170af98a7984e051de8f2c9a350cbcc..220af0bae6aa31bedd6a9754b543bbcd6650467b 100644
--- a/ash/test/test_shelf_delegate.h
+++ b/ash/test/test_shelf_delegate.h
@@ -56,7 +56,8 @@ class TestShelfDelegate : public ShelfDelegate, public aura::WindowObserver {
   void OnShelfAutoHideBehaviorChanged(Shelf* shelf) override;
   void OnShelfAutoHideStateChanged(Shelf* shelf) override;
   void OnShelfVisibilityStateChanged(Shelf* shelf) override;
-  ShelfID GetShelfIDForAppID(const std::string& app_id) override;
+  ShelfID GetShelfIDForAppID(const std::string& app_id,
+                             const std::string& app_shelf_id) override;
   bool HasShelfIDToAppIDMapping(ShelfID id) const override;
   const std::string& GetAppIDForShelfID(ShelfID id) override;
   void PinAppWithID(const std::string& app_id) override;