Do not use NSAnimation to drive scrollbar animations.

Source/platform/blink_platform.gyp

 #
 # Copyright (C) 2013 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
@@ skipping 268 matching lines @@
       }],
       ['OS=="mac"', {
         'dependencies': [
           '<(DEPTH)/third_party/harfbuzz-ng/harfbuzz.gyp:harfbuzz-ng',
         ],
         'link_settings': {
           'libraries': [
             '$(SDKROOT)/System/Library/Frameworks/Accelerate.framework',
             '$(SDKROOT)/System/Library/Frameworks/Carbon.framework',
             '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
+            '$(SDKROOT)/System/Library/Frameworks/QuartzCore.framework',
           ]
         },
         'sources/': [
           # We use LocaleMac.mm instead of LocaleICU.cpp
           ['exclude', 'text/LocaleICU\\.(cpp|h)$'],
           ['include', 'text/LocaleMac\\.mm$'],
 
           # The Mac uses mac/KillRingMac.mm instead of the dummy
           # implementation.
           ['exclude', 'KillRingNone\\.cpp$'],
@@ skipping 182 matching lines @@
           ['OS=="android"', {
             'cflags!': ['-mthumb'],
           }],
         ],
       },{  # target_arch!="arm"
         'type': 'none',
       }],
     ],
   }],
 }