First shot at implementing drag&drop for Aura

views/widget/native_widget_aura.h

Index: views/widget/native_widget_aura.h
diff --git a/views/widget/native_widget_aura.h b/views/widget/native_widget_aura.h
index c93c61b21feae3a8fe6784d901cfe4b5226f64ad..151bdd6ea62492e2ff07e50ebd6cada21c098d25 100644
--- a/views/widget/native_widget_aura.h
+++ b/views/widget/native_widget_aura.h
@@ -8,6 +8,7 @@
 
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
+#include "ui/aura/client/window_drag_drop_delegate.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/events.h"
 #include "views/views_export.h"
@@ -22,10 +23,12 @@ class Font;
 
 namespace views {
 
+class DropHelper;
 class TooltipManagerViews;
 
 class VIEWS_EXPORT NativeWidgetAura : public internal::NativeWidgetPrivate,
-                                      public aura::WindowDelegate {
+                                      public aura::WindowDelegate,
+                                      public aura::WindowDragDropDelegate {
  public:
   explicit NativeWidgetAura(internal::NativeWidgetDelegate* delegate);
   virtual ~NativeWidgetAura();
@@ -139,6 +142,13 @@ class VIEWS_EXPORT NativeWidgetAura : public internal::NativeWidgetPrivate,
   virtual void OnWindowDestroyed() OVERRIDE;
   virtual void OnWindowVisibilityChanged(bool visible) OVERRIDE;
 
+  // Overridden from aura::WindowDragDropDelegate:
+  virtual bool CanDrop(const aura::DropTargetEvent& event) OVERRIDE;
+  virtual void OnDragEntered(const aura::DropTargetEvent& event) OVERRIDE;
+  virtual int OnDragUpdated(const aura::DropTargetEvent& event) OVERRIDE;
+  virtual void OnDragExited() OVERRIDE;
+  virtual int OnPerformDrop(const aura::DropTargetEvent& event) OVERRIDE;
+
  private:
   class DesktopObserverImpl;
 
@@ -162,6 +172,8 @@ class VIEWS_EXPORT NativeWidgetAura : public internal::NativeWidgetPrivate,
 
   scoped_ptr<DesktopObserverImpl> desktop_observer_;
 
+  scoped_ptr<DropHelper> drop_helper_;
+
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetAura);
 };