Move BitmapPlatformDevice::makeOpaque into a shared file

skia/skia.gyp

 # Copyright (c) 2010 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.
 
 {
   'targets': [
     {
       'target_name': 'skia',
       'type': '<(library)',
       'msvs_guid': 'CD9CA56E-4E94-444C-87D4-58CA1E6F300D',
@@ skipping 479 matching lines @@
         '../third_party/skia/include/ports/SkStream_Win.h',
 
         '../third_party/skia/include/images/SkFlipPixelRef.h',
         '../third_party/skia/include/images/SkImageDecoder.h',
         '../third_party/skia/include/images/SkImageEncoder.h',
         '../third_party/skia/include/images/SkImageRef.h',
         '../third_party/skia/include/images/SkImageRef_GlobalPool.h',
         '../third_party/skia/include/images/SkMovie.h',
         '../third_party/skia/include/images/SkPageFlipper.h',
 
+        'ext/bitmap_platform_device.cc',
         'ext/bitmap_platform_device.h',
         'ext/bitmap_platform_device_data.h',
         'ext/bitmap_platform_device_linux.cc',
         'ext/bitmap_platform_device_linux.h',
         'ext/bitmap_platform_device_mac.cc',
         'ext/bitmap_platform_device_mac.h',
         'ext/bitmap_platform_device_win.cc',
         'ext/bitmap_platform_device_win.h',
         'ext/convolver.cc',
         'ext/convolver.h',
@@ skipping 223 matching lines @@
       ],
     },
   ],
 }
 
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