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diff --git a/chrome/views/root_view_drop_target.h b/chrome/views/root_view_drop_target.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CHROME_VIEWS_ROOT_VIEW_DROP_TARGET_H__
+#define CHROME_VIEWS_ROOT_VIEW_DROP_TARGET_H__
+
+#include <atlbase.h>
+#include <atlapp.h>
+#include <atlmisc.h>
+
+#include "base/base_drop_target.h"
+#include "chrome/common/os_exchange_data.h"
+
+namespace ChromeViews {
+
+class RootView;
+class View;
+
+// RootViewDropTarget takes care of managing drag and drop for the RootView and
+// converts Windows OLE drop messages into Views drop messages.
+//
+// RootViewDropTarget is responsible for determining the appropriate View to
+// use during a drag and drop session, and forwarding events to it.
+class RootViewDropTarget : public BaseDropTarget {
+ public:
+  explicit RootViewDropTarget(RootView* root_view);
+  virtual ~RootViewDropTarget();
+
+  // If a drag and drop is underway and view is the current drop target, the
+  // drop target is set to null.
+  // This is invoked when a View is removed from the RootView to make sure
+  // we don't target a view that was removed during dnd.
+  void ResetTargetViewIfEquals(View* view);
+
+ protected:
+  virtual DWORD OnDragOver(IDataObject* data_object,
+                           DWORD key_state,
+                           POINT cursor_position,
+                           DWORD effect);
+
+  virtual void OnDragLeave(IDataObject* data_object);
+
+  virtual DWORD OnDrop(IDataObject* data_object,
+                       DWORD key_state,
+                       POINT cursor_position,
+                       DWORD effect);
+
+ private:
+  // Calculates the target view for a drop given the specified location in
+  // the coordinate system of the rootview. This tries to avoid continually
+  // querying CanDrop by returning target_view_ if the mouse is still over
+  // target_view_.
+  View* CalculateTargetView(const CPoint& root_view_location,
+                            const OSExchangeData& data);
+
+  // RootView we were created for.
+  RootView* root_view_;
+
+  // View we're targeting events at.
+  View* target_view_;
+
+  // The deepest view under the current drop coordinate.
+  View* deepest_view_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(RootViewDropTarget);
+};
+
+}  // namespace
+
+#endif  // CHROME_VIEWS_ROOT_VIEW_DROP_TARGET_H__