aura-mus: wire up drag and drop.

ui/aura/mus/window_port_mus.h

 // Copyright 2016 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 UI_AURA_MUS_WINDOW_PORT_MUS_H_
 #define UI_AURA_MUS_WINDOW_PORT_MUS_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 41 matching lines @@
 
   void SetTextInputState(mojo::TextInputStatePtr state);
   void SetImeVisibility(bool visible, mojo::TextInputStatePtr state);
 
   ui::mojom::Cursor predefined_cursor() const { return predefined_cursor_; }
   void SetPredefinedCursor(ui::mojom::Cursor cursor_id);
 
   // Sets the EventTargetingPolicy, default is TARGET_AND_DESCENDANTS.
   void SetEventTargetingPolicy(ui::mojom::EventTargetingPolicy policy);
 
+  // Sets whether this window can accept drops, defaults to false.
+  void SetCanAcceptDrops(bool can_accept_drops);
+
   // Embeds a new client in this Window. See WindowTreeClient::Embed() for
   // details on arguments.
   void Embed(ui::mojom::WindowTreeClientPtr client,
              uint32_t flags,
              const ui::mojom::WindowTree::EmbedCallback& callback);
 
   std::unique_ptr<ui::WindowCompositorFrameSink> RequestCompositorFrameSink(
       scoped_refptr<cc::ContextProvider> context_provider,
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager);
 
@@ skipping 178 matching lines @@
   cc::SurfaceInfo surface_info_;
 
   ui::mojom::Cursor predefined_cursor_ = ui::mojom::Cursor::CURSOR_NULL;
 
   DISALLOW_COPY_AND_ASSIGN(WindowPortMus);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_MUS_WINDOW_PORT_MUS_H_