Wires up drag/drop for aura-mus

services/ui/public/interfaces/window_tree.mojom

 // 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.
 
 module ui.mojom;
 
 import "cc/ipc/surface_id.mojom";
 import "cc/ipc/surface_sequence.mojom";
 import "cc/ipc/mojo_compositor_frame_sink.mojom";
 import "services/ui/public/interfaces/cursor.mojom";
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   // Called when the mouse cursor enters a window on this connection for the
   // first time, providing a list of available mime types. We want to send this
   // set of data only one time, so this isn't part of OnDragEnter(), which
   // occurs every time the mouse enters a window.
   OnDragDropStart(map<string, array<uint8>> drag_data);
 
   // Called when the mouse cursor enters a window that has opted into
   // accepting drags through SetAcceptsDrags(), providing a list
   // of available mime types.  Returns a bitmask of the supported
-  // operations.
+  // operations. |screen_position| is in screen coordinates.
   OnDragEnter(uint32 window,
               uint32 key_state,
-              gfx.mojom.Point position,
+              gfx.mojom.Point screen_position,
               uint32 effect_bitmask) => (uint32 supported_op_bitmask);
 
   // Called when the pointer moves over the window after the initial
   // DragEnter. Returns a bitmask of the supported operations at this
-  // location.
+  // location. |screen_position| is in screen coordinates.
   OnDragOver(uint32 window,
              uint32 key_state,
-             gfx.mojom.Point position,
+             gfx.mojom.Point screen_position,
              uint32 effect_bitmask) => (uint32 supported_op_bitmask);
 
   // Called when the pointer leaves a window or if the drop is
   // canceled.
   OnDragLeave(uint32 window);
 
   // Called when the drop occurs on a window. Returns the action
-  // taken.
+  // taken. |screen_position| is in screen coordinates.
   OnCompleteDrop(uint32 window,
                  uint32 key_state,
-                 gfx.mojom.Point position,
+                 gfx.mojom.Point screen_position,
                  uint32 effect_bitmask) => (uint32 action_taken);
 
   // Called on the client that requested PerformDragDrop() to return which drag
   // action was completed. This is called instead of OnChangeCompleted().
   OnPerformDragDropCompleted(uint32 window, bool success, uint32 action_taken);
 
   // Called after OnCompleteDrop completes for every connection which received
   // an OnDragDropStart() message. This signals that a client can forget the
   // |drag_data| passed in via the first message.
   OnDragDropDone();
 
   // A change initiated from the client has completed. See description of
   // change ids for details.
   OnChangeCompleted(uint32 change_id, bool success);
 
   // The WindowManager is requesting the specified window to close. If the
   // client allows the change it should delete the window.
   RequestClose(uint32 window_id);
 
   // See description of WindowManager for details.
   GetWindowManager(associated WindowManager& internal);
 };
 
 // Mus provides this interface as a way for clients to connect and obtain a
 // WindowTree handle with a supplied WindowTreeClient handle. The
 // WindowTreeClient has no roots, use NewTopLevelWindow() to create one.
 interface WindowTreeFactory {
   CreateWindowTree(WindowTree& tree_request, WindowTreeClient client);
 };