Tab dragging as implemented as a mus API.

components/mus/public/cpp/window.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_PUBLIC_CPP_WINDOW_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 203 matching lines @@
 
   // NOTE: callback is run synchronously if Embed() is not allowed on this
   // Window.
   void Embed(mus::mojom::WindowTreeClientPtr client,
              const EmbedCallback& callback);
 
   // TODO(sky): this API is only applicable to the WindowManager. Move it
   // to a better place.
   void RequestClose();
 
+  // Tells the window manager to take control of moving the window. Locally,

[sky, 2016/06/24 19:59:00]

Update comment.

+  // this spins up a nested message loop to handle all further ui messages; we
+  // don't use mojo's built in sync messages because we explicitly want to
+  // process all other messages. Returns true if the move wasn't canceled.
+  void PerformWindowMove(const gfx::Point& cursor_location,
+                         const base::Callback<void(bool)>& callback);
+
+  // Tells the window manager to abort any current move initiated by
+  // PerformWindowMove().
+  void CancelWindowMove();
+
   // Returns an internal name, set by a client app when it creates a window.
   std::string GetName() const;
 
  protected:
   // This class is subclassed only by test classes that provide a public ctor.
   Window();
   ~Window();
 
  private:
   friend class WindowPrivate;
@@ skipping 112 matching lines @@
   };
 
   std::map<const void*, Value> prop_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_