Tab dragging as implemented as a mus API.

components/mus/public/cpp/tests/test_window_tree.cc

Index: components/mus/public/cpp/tests/test_window_tree.cc
diff --git a/components/mus/public/cpp/tests/test_window_tree.cc b/components/mus/public/cpp/tests/test_window_tree.cc
index 01b4b4c121d889a26bed9cd9eb1209994d220874..d99a697055fe17711d0aa248130a79292c29683b 100644
--- a/components/mus/public/cpp/tests/test_window_tree.cc
+++ b/components/mus/public/cpp/tests/test_window_tree.cc
@@ -164,4 +164,11 @@ void TestWindowTree::GetCursorLocationMemory(
   callback.Run(mojo::ScopedSharedBufferHandle());
 }
 
+void TestWindowTree::PerformWindowMove(uint32_t change_id,
+                                       uint32_t window_id,
+                                       ::mus::mojom::MoveLoopSource source,
+                                       const gfx::Point& cursor_location) {}
+
+void TestWindowTree::CancelWindowMove(uint32_t window_id) {}
+
 }  // namespace mus