Index: Tools/DumpRenderTree/chromium/TestRunner/public/WebPreferences.h
diff --git a/Tools/DumpRenderTree/chromium/TestRunner/public/WebPreferences.h b/Tools/DumpRenderTree/chromium/TestRunner/public/WebPreferences.h
index 5644d099fe47a06540221ada1df0ffa85d45c9dc..3100d8bdbda41dbe537859271cdf438b3c27d47b 100644
--- a/Tools/DumpRenderTree/chromium/TestRunner/public/WebPreferences.h
+++ b/Tools/DumpRenderTree/chromium/TestRunner/public/WebPreferences.h
@@ -90,6 +90,7 @@ struct WEBTESTRUNNER_EXPORT WebPreferences {
bool acceleratedCompositingForVideoEnabled;
bool acceleratedCompositingForFixedPositionEnabled;
bool acceleratedCompositingForOverflowScrollEnabled;
+ bool acceleratedCompositingForFixedRootBackgroundEnabled;
bool acceleratedCompositingEnabled;
bool forceCompositingMode;
bool threadedHTMLParser;