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

ash/shelf/shelf_view_unittest.cc

Index: ash/shelf/shelf_view_unittest.cc
diff --git a/ash/shelf/shelf_view_unittest.cc b/ash/shelf/shelf_view_unittest.cc
index 5f0fe5e1bf92016f8a8805bcdbbb5ce1ff1011fd..a8489f13566f148bb9bcc9aa9909b7c7fa2dfef1 100644
--- a/ash/shelf/shelf_view_unittest.cc
+++ b/ash/shelf/shelf_view_unittest.cc
@@ -266,6 +266,11 @@ class TestShelfDelegateForShelfView : public ShelfDelegate {
     return id;
   }
 
+  ShelfID GetShelfIDForAppIDAndLaunchID(const std::string& app_id,
+                                        const std::string& launch_id) override {
+    return GetShelfIDForAppID(app_id);
+  }
+
   bool HasShelfIDToAppIDMapping(ShelfID id) const override { return true; }
 
   const std::string& GetAppIDForShelfID(ShelfID id) override {