linux aura: Show the drag-image when available.

ui/views/widget/desktop_aura/x11_whole_screen_move_loop.h

Index: ui/views/widget/desktop_aura/x11_whole_screen_move_loop.h
diff --git a/ui/views/widget/desktop_aura/x11_whole_screen_move_loop.h b/ui/views/widget/desktop_aura/x11_whole_screen_move_loop.h
index ceff84f9fb29591f9ac49f90340d10e25362658c..c0c25466647f251463af7b6430eae47eb25a3be4 100644
--- a/ui/views/widget/desktop_aura/x11_whole_screen_move_loop.h
+++ b/ui/views/widget/desktop_aura/x11_whole_screen_move_loop.h
@@ -7,15 +7,21 @@
 
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
+#include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/native_widget_types.h"
+#include "ui/gfx/vector2d_f.h"
 #include "ui/views/widget/desktop_aura/x11_whole_screen_move_loop_delegate.h"
 
+typedef struct _XDisplay XDisplay;
+
 namespace aura {
 class Window;
 }
 
 namespace views {
 
+class Widget;
+
 // Runs a nested message loop and grabs the mouse. This is used to implement
 // dragging.
 class X11WholeScreenMoveLoop : public base::MessageLoop::Dispatcher {
@@ -37,11 +43,20 @@ class X11WholeScreenMoveLoop : public base::MessageLoop::Dispatcher {
   // Ends the RunMoveLoop() that's currently in progress.
   void EndMoveLoop();
 
+  // Sets an image to be used during the drag.
+  void SetDragImage(const gfx::ImageSkia& image, gfx::Vector2dF offset);
+
  private:
   // Grabs the pointer, setting the mouse cursor to |cursor|. Returns true if
   // the grab was successful.
   bool GrabPointerWithCursor(gfx::NativeCursor cursor);
 
+  // Creates an input-only window to be used during the drag.
+  Window CreateDragInputWindow(XDisplay* display);
+
+  // Creates a window to show the drag image during the drag.
+  void CreateDragImageWindow();
+
   X11WholeScreenMoveLoopDelegate* delegate_;
 
   // Are we running a nested message loop from RunMoveLoop()?
@@ -54,6 +69,12 @@ class X11WholeScreenMoveLoop : public base::MessageLoop::Dispatcher {
 
   base::Closure quit_closure_;
 
+  // A Widget is created during the drag if there is an image available to be
+  // used during the drag.
+  scoped_ptr<Widget> drag_widget_;
+  gfx::ImageSkia drag_image_;
+  gfx::Vector2dF drag_offset_;
+
   DISALLOW_COPY_AND_ASSIGN(X11WholeScreenMoveLoop);
 };