| Index: public/platform/WebCompositingReasons.h | 
| diff --git a/public/platform/WebCompositingReasons.h b/public/platform/WebCompositingReasons.h | 
| index 03ae0be6ea80d3cf540046e9f4dedf9cddcd316f..4affa6d25b0b72db63492f050a4006721cab31f9 100644 | 
| --- a/public/platform/WebCompositingReasons.h | 
| +++ b/public/platform/WebCompositingReasons.h | 
| @@ -71,6 +71,7 @@ const uint64_t CompositingReasonLayerForBackground                     = static_ | 
| const uint64_t CompositingReasonLayerForMask                           = static_cast<uint64_t>(1) << 31; | 
| const uint64_t CompositingReasonOverflowScrollingParent                = static_cast<uint64_t>(1) << 32; | 
| const uint64_t CompositingReasonOutOfFlowClipping                      = static_cast<uint64_t>(1) << 33; | 
| +const uint64_t CompositingReasonIsolateCompositedDescendants           = static_cast<uint64_t>(1) << 35; | 
|  | 
| typedef uint64_t WebCompositingReasons; | 
|  | 
|  |