aura-mus: add a drag representation image.

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/frame_sink_id.mojom";
 import "cc/ipc/local_surface_id.mojom";
 import "cc/ipc/surface_info.mojom";
 import "cc/ipc/mojo_compositor_frame_sink.mojom";
 import "services/ui/public/interfaces/cursor.mojom";
 import "services/ui/public/interfaces/event_matcher.mojom";
 import "services/ui/public/interfaces/mus_constants.mojom";
 import "services/ui/public/interfaces/window_manager.mojom";
 import "services/ui/public/interfaces/window_manager_constants.mojom";
 import "services/ui/public/interfaces/window_tree_constants.mojom";
+import "skia/public/interfaces/bitmap.mojom";
 import "ui/base/mojo/ui_base_types.mojom";
 import "ui/events/mojo/event.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 import "ui/platform_window/mojo/text_input_state.mojom";
 
 // Windows are identified by a uint32. The upper 16 bits are the connection id,
 // and the lower 16 the id assigned by the client.
 //
 // The root window is identified with a connection id of 0, and value of 1.
 //
@@ skipping 259 matching lines @@
   // when a client sends this message and when the window manager starts acting
   // on it, pass the cursor location at the start of the move.
   PerformWindowMove(uint32 change_id, uint32 window_id, MoveLoopSource source,
                     gfx.mojom.Point cursor);
 
   // Tells the window manager to cancel any in progress window move started with
   // StartWindowMove() and to revert the window bounds to how they were.
   CancelWindowMove(uint32 window_id);
 
   // Called by the client to start a drag operation. |source_window_id| is the
-  // source window, |drag_data| is the entire set of mime to raw data
-  // mapping. We send this during the start of the drag because most views
+  // source window, |screen_location| is what the source thinks their location
+  // of the pointer which started the drag is, |drag_data| is the entire set of
+  // mime to raw data mapping. |drag_image| and |drag_image_offset| describe
+  // an image to hold behind the cursor which represents the data on the
+  // clipboard. We send this during the start of the drag because most views
   // clients will try to read all this data on first entry.
+  //
+  // TODO(erg): SkBitmap is the wrong data type for the drag image; we should
+  // be passing ImageSkias once http://crbug.com/655874 is implemented.
   PerformDragDrop(uint32 change_id,
                   uint32 source_window_id,
+                  gfx.mojom.Point screen_location,
                   map<string, array<uint8>> drag_data,
-                  uint32 drag_operation);
+                  skia.mojom.Bitmap? drag_image,
+                  gfx.mojom.Vector2d drag_image_offset,
+                  uint32 drag_operation,
+                  DragEventSource source);
 
   // Called by the client to cancel any in progress drag drop operation. This
   // will result in a change completed for the underlying change.
   CancelDragDrop(uint32 window_id);
 };
 
 // Changes to windows are not sent to the connection that originated the
 // change. For example, if connection 1 changes the bounds of a window by
 // calling SetWindowBounds(), connection 1 does not receive
 // OnWindowBoundsChanged().
@@ skipping 195 matching lines @@
   // 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);
 };