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 7231fde6f29277cde5cbc3b372d79ca28760fb8a..7066abe6c2b5a3f9b75c30c19b21ba654af082b1 100644
--- a/components/mus/public/cpp/tests/test_window_tree.cc
+++ b/components/mus/public/cpp/tests/test_window_tree.cc
@@ -163,4 +163,10 @@ void TestWindowTree::GetCursorLocationMemory(
   callback.Run(mojo::ScopedSharedBufferHandle());
 }
 
+void TestWindowTree::PerformWindowMove(uint32_t change_id,
+                                       uint32_t window_id,
+                                       const gfx::Point& cursor_location) {}
+
+void TestWindowTree::CancelWindowMove(uint32_t window_id) {}
+
 }  // namespace mus