aura-mus: Hook up PerformWindowMove().

ui/aura/mus/window_tree_host_mus.cc

Index: ui/aura/mus/window_tree_host_mus.cc
diff --git a/ui/aura/mus/window_tree_host_mus.cc b/ui/aura/mus/window_tree_host_mus.cc
index 820702a4a4fb6e07a6267d9252bb93be784e0fda..95fa6b4766dcfbccca72d38d0aaf25ae0748b437 100644
--- a/ui/aura/mus/window_tree_host_mus.cc
+++ b/ui/aura/mus/window_tree_host_mus.cc
@@ -157,6 +157,18 @@ void WindowTreeHostMus::StackAtTop() {
   delegate_->OnWindowTreeHostStackAtTop(this);
 }
 
+void WindowTreeHostMus::PerformWindowMove(
+    ui::mojom::MoveLoopSource mus_source,
+    const gfx::Point& cursor_location,
+    const base::Callback<void(bool)>& callback) {
+  delegate_->OnWindowTreeHostPerformWindowMove(
+      this, mus_source, cursor_location, callback);
+}
+
+void WindowTreeHostMus::CancelWindowMove() {
+  delegate_->OnWindowTreeHostCancelWindowMove(this);
+}
+
 display::Display WindowTreeHostMus::GetDisplay() const {
   display::Display display;
   display::Screen::GetScreen()->GetDisplayWithDisplayId(display_id_, &display);