| Index: third_party/WebKit/Source/core/dom/StyleEngine.cpp | 
| diff --git a/third_party/WebKit/Source/core/dom/StyleEngine.cpp b/third_party/WebKit/Source/core/dom/StyleEngine.cpp | 
| index 6e10d0a669856f096c4619b06d57cf270511920e..4f9bfeef2d829d125e8506f72ba4c3cd731ec558 100644 | 
| --- a/third_party/WebKit/Source/core/dom/StyleEngine.cpp | 
| +++ b/third_party/WebKit/Source/core/dom/StyleEngine.cpp | 
| @@ -307,6 +307,8 @@ void StyleEngine::updateActiveStyleSheets(StyleResolverUpdateMode updateMode) | 
| if (!document().isActive()) | 
| return; | 
|  | 
| +    TRACE_EVENT0("blink,blink_style", "StyleEngine::updateActiveStyleSheets"); | 
| + | 
| if (shouldUpdateDocumentStyleSheetCollection(updateMode)) | 
| documentStyleSheetCollection()->updateActiveStyleSheets(*this, updateMode); | 
|  | 
|  |