Wire the AMD switchable videcard detection

content/content_gpu.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../skia/skia.gyp:skia',
     '../ui/gl/gl.gyp:gl',
   ],
@@ skipping 71 matching lines @@
           'action': [
             'python',
             '../build/extract_from_cab.py',
             '..\\third_party\\directxsdk\\files\\Redist\\<(input)',
             '<(output)',
             '<(PRODUCT_DIR)',
           ],
         },
       ],
     }],
+    ['OS=="win" and buildtype=="Official"', {
+      'sources': [
+        '../third_party/amd/AmdCfxPxExt.h',
+        '../third_party/amd/amd_videocard_info_win.cc',
+      ],
+    }],
     ['OS=="linux"', {
       'dependencies': [
         '../third_party/libXNVCtrl/libXNVCtrl.gyp:libXNVCtrl',
       ],
     }],
   ],
 }