Tab dragging as implemented as a mus API.

components/mus/ws/test_utils.cc

Index: components/mus/ws/test_utils.cc
diff --git a/components/mus/ws/test_utils.cc b/components/mus/ws/test_utils.cc
index ada01b34fbe754b6fa565795dd91c4bc7170dd44..278c6615174e8cc5fad2fd9f8ff6148b852eeed0 100644
--- a/components/mus/ws/test_utils.cc
+++ b/components/mus/ws/test_utils.cc
@@ -165,6 +165,14 @@ void TestWindowManager::WmCreateTopLevelWindow(
 void TestWindowManager::WmClientJankinessChanged(ClientSpecificId client_id,
                                                  bool janky) {}
 
+void TestWindowManager::WmPerformMoveLoop(uint32_t change_id,
+                                          uint32_t window_id,
+                                          const gfx::Point& cursor_location) {
+  on_perform_move_loop_called_ = true;
+}
+
+void TestWindowManager::WmCancelMoveLoop(uint32_t window_id) {}
+
 void TestWindowManager::OnAccelerator(uint32_t id,
                                       std::unique_ptr<ui::Event> event) {
   on_accelerator_called_ = true;
@@ -298,6 +306,12 @@ void TestWindowTreeClient::OnChangeCompleted(uint32_t change_id, bool success) {
     tracker_.OnChangeCompleted(change_id, success);
 }
 
+void TestWindowTreeClient::OnMoveLoopCompleted(uint32_t change_id,
+                                               bool success) {
+  if (record_on_change_completed_)
+    tracker_.OnChangeCompleted(change_id, success);
+}
+
 void TestWindowTreeClient::RequestClose(uint32_t window_id) {}
 
 void TestWindowTreeClient::GetWindowManager(