Tab dragging as implemented as a mus API.

components/mus/ws/window_tree.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_MUS_WS_WINDOW_TREE_H_
 #define COMPONENTS_MUS_WS_WINDOW_TREE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 387 matching lines @@
   void SetClientArea(
       Id transport_window_id,
       const gfx::Insets& insets,
       mojo::Array<gfx::Rect> transport_additional_client_areas) override;
   void SetHitTestMask(Id transport_window_id, const gfx::Rect& mask) override;
   void GetWindowManagerClient(
       mojo::AssociatedInterfaceRequest<mojom::WindowManagerClient> internal)
       override;
   void GetCursorLocationMemory(const GetCursorLocationMemoryCallback& callback)
       override;
+  void PerformWindowMove(uint32_t change_id,
+                         Id window_id,
+                         ::mus::mojom::MoveLoopSource source,
+                         const gfx::Point& cursor) override;
+  void CancelWindowMove(Id window_id) override;
 
   // mojom::WindowManagerClient:
   void AddAccelerator(uint32_t id,
                       mojom::EventMatcherPtr event_matcher,
                       const AddAcceleratorCallback& callback) override;
   void RemoveAccelerator(uint32_t id) override;
   void AddActivationParent(Id transport_window_id) override;
   void RemoveActivationParent(Id transport_window_id) override;
   void ActivateNextWindow() override;
   void SetUnderlaySurfaceOffsetAndExtendedHitArea(
@@ skipping 70 matching lines @@
       waiting_for_top_level_window_info_;
   bool embedder_intercepts_events_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTree);
 };
 
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_WINDOW_TREE_H_