Fix Aura can't provide accurate cursor hotspot info.

ui/gfx/icon_util.h

 // Copyright (c) 2012 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 UI_GFX_ICON_UTIL_H_
 #define UI_GFX_ICON_UTIL_H_
 
 #include <windows.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 123 matching lines @@
       const base::FilePath& icon_path,
       WriteType write_type = ATOMIC_WRITE);
 
   // Creates a cursor of the specified size from the DIB passed in.
   // Returns the cursor on success or NULL on failure.
   static base::win::ScopedHICON CreateCursorFromDIB(const gfx::Size& icon_size,
                                                     const gfx::Point& hotspot,
                                                     const void* dib_bits,
                                                     size_t dib_size);
 
+  // Given a valid HICON handle representing an icon, this function retrieves
+  // the hot spot of the icon.
+  static gfx::Point GetHotSpotFromHICON(HICON icon);
+
  private:
   // The icon format is published in the MSDN but there is no definition of
   // the icon file structures in any of the Windows header files so we need to
   // define these structure within the class. We must make sure we use 2 byte
   // packing so that the structures are laid out properly within the file.
   // See: http://msdn.microsoft.com/en-us/library/ms997538.aspx
 #pragma pack(push)
 #pragma pack(2)
 
   // ICONDIRENTRY contains meta data for an individual icon image within a
@@ skipping 111 matching lines @@
   // A helper function of CreateSkBitmapFromHICON.
   static SkBitmap CreateSkBitmapFromHICONHelper(HICON icon,
                                                 const gfx::Size& s);
 
   // Prevent clients from instantiating objects of that class by declaring the
   // ctor/dtor as private.
   DISALLOW_IMPLICIT_CONSTRUCTORS(IconUtil);
 };
 
 #endif  // UI_GFX_ICON_UTIL_H_