Don't update graphics layer positions during coordinated scrolling

Source/core/core.gyp

 #
 # Copyright (C) 2009 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 21 matching lines @@
   'includes': [
     '../WebKit/chromium/WinPrecompile.gypi',
     'features.gypi',
     '../modules/modules.gypi',
     '../bindings/bindings.gypi',
     'core.gypi',
   ],
 
   'variables': {
     'enable_wexit_time_destructors': 1,
+    'blink_scrolling_position_no_offset%': 0,
 
     'webcore_include_dirs': [
       '../..',
       '..',
       '<(SHARED_INTERMEDIATE_DIR)/webkit',
       '<(SHARED_INTERMEDIATE_DIR)/webkit/bindings',
     ],
 
     'conditions': [
       ['OS=="android" and use_openmax_dl_fft!=0', {
@@ skipping 903 matching lines @@
         ['OS=="android"', {
           'sources/': [
             ['include', 'rendering/RenderThemeChromiumFontProviderLinux\\.cpp$'],
             ['include', 'rendering/RenderThemeChromiumDefault\\.cpp$'],
           ],
         },{ # OS!="android"
           'sources/': [
             ['exclude', 'Android\\.cpp$'],
           ],
         }],
+        ['blink_scrolling_position_no_offset==1', {
+          'defines': [
+            'BLINK_SCROLLING_POSITION_NO_OFFSET',
+          ]
+        }],
       ],
     },
     {
       'target_name': 'webcore_remaining',
       'type': 'static_library',
       'dependencies': [
         '<(DEPTH)/third_party/v8-i18n/build/all.gyp:v8-i18n',
         'webcore_prerequisites',
       ],
       'sources': [
@@ skipping 138 matching lines @@
         '<(SHARED_INTERMEDIATE_DIR)/webkit/bindings/V8InternalSettingsGenerated.h',
         '<(SHARED_INTERMEDIATE_DIR)/webkit/bindings/V8InternalRuntimeFlags.cpp',
         '<(SHARED_INTERMEDIATE_DIR)/webkit/bindings/V8InternalRuntimeFlags.h',
       ],
       'sources/': [
         ['exclude', 'testing/js'],
       ],
     },
   ],  # targets
 }