Tab dragging as implemented as a mus API.

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

Index: components/mus/public/cpp/tests/window_server_test_base.cc
diff --git a/components/mus/public/cpp/tests/window_server_test_base.cc b/components/mus/public/cpp/tests/window_server_test_base.cc
index 93394f79e1c3dfe10e2a283435a0eff535e5e7a6..75cf144ae5d58ba82b61934078369677e650e309 100644
--- a/components/mus/public/cpp/tests/window_server_test_base.cc
+++ b/components/mus/public/cpp/tests/window_server_test_base.cc
@@ -137,6 +137,21 @@ void WindowServerTestBase::OnAccelerator(uint32_t id, const ui::Event& event) {
     window_manager_delegate_->OnAccelerator(id, event);
 }
 
+void WindowServerTestBase::OnWmPerformMoveLoop(
+    uint32_t change_id,
+    uint32_t window_id,
+    const gfx::Point& cursor_location) {
+  if (window_manager_delegate_) {
+    window_manager_delegate_->OnWmPerformMoveLoop(change_id, window_id,
+                                                  cursor_location);
+  }
+}
+
+void WindowServerTestBase::OnWmCancelMoveLoop(uint32_t window_id) {
+  if (window_manager_delegate_)
+    window_manager_delegate_->OnWmCancelMoveLoop(window_id);
+}
+
 void WindowServerTestBase::Create(shell::Connection* connection,
                                   mojom::WindowTreeClientRequest request) {
   new WindowTreeClient(this, nullptr, std::move(request));