diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/base/base_drag_source.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/base/base_drag_source.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+// Copyright (c) 2006-2008 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 BASE_BASE_DRAG_SOURCE_H_
+#define BASE_BASE_DRAG_SOURCE_H_
+
+#include <objidl.h>
+
+#include "base/basictypes.h"
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// BaseDragSource
+//
+//  A base IDropSource implementation. Handles notifications sent by an active
+//  drag-drop operation as the user mouses over other drop targets on their
+//  system. This object tells Windows whether or not the drag should continue,
+//  and supplies the appropriate cursors.
+//
+class BaseDragSource : public IDropSource {
+ public:
+  BaseDragSource();
+  virtual ~BaseDragSource() { }
+
+  // IDropSource implementation:
+  HRESULT __stdcall QueryContinueDrag(BOOL escape_pressed, DWORD key_state);
+  HRESULT __stdcall GiveFeedback(DWORD effect);
+
+  // IUnknown implementation:
+  HRESULT __stdcall QueryInterface(const IID& iid, void** object);
+  ULONG __stdcall AddRef();
+  ULONG __stdcall Release();
+
+ protected:
+  virtual void OnDragSourceCancel() { }
+  virtual void OnDragSourceDrop() { }
+  virtual void OnDragSourceMove() { }
+
+ private:
+  LONG ref_count_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(BaseDragSource);
+};
+
+#endif  // BASE_BASE_DRAG_SOURCE_H_