Don't update graphics layer positions during coordinated scrolling

Source/core/core.gyp

Index: Source/core/core.gyp
diff --git a/Source/core/core.gyp b/Source/core/core.gyp
index 4034ffea4522617b44add9d0040282d7dbeadc76..06b2baca472f4d730028c9822bc1213e8c0bab67 100644
--- a/Source/core/core.gyp
+++ b/Source/core/core.gyp
@@ -39,6 +39,7 @@
 
   'variables': {
     'enable_wexit_time_destructors': 1,
+    'blink_scrolling_position_no_offset%': 0,
 
     'webcore_include_dirs': [
       '../..',
@@ -962,6 +963,11 @@
             ['exclude', 'Android\\.cpp$'],
           ],
         }],
+        ['blink_scrolling_position_no_offset==1', {
+          'defines': [
+            'BLINK_SCROLLING_POSITION_NO_OFFSET',
+          ]
+        }],
       ],
     },
     {