| Index: Source/core/page/Settings.in | 
| diff --git a/Source/core/page/Settings.in b/Source/core/page/Settings.in | 
| index 6d4ac6a5b37226941e35be3d56a0a06139761cd9..9a01780189b589ed2d2c876b59222fb2f8c4f515 100644 | 
| --- a/Source/core/page/Settings.in | 
| +++ b/Source/core/page/Settings.in | 
| @@ -69,6 +69,7 @@ acceleratedCompositingForAnimationEnabled initial=true | 
| acceleratedCompositingForFixedPositionEnabled initial=false | 
| acceleratedCompositingForOverflowScrollEnabled initial=false | 
| acceleratedCompositingForTransitionEnabled initial=false | 
| +acceleratedCompositingForFixedRootBackgroundEnabled initial=false | 
|  | 
| # Works only in conjunction with forceCompositingMode. | 
| acceleratedCompositingForScrollableFramesEnabled initial=false | 
|  |