Add histograms for parseAuthorStyleSheet and updateStyle

third_party/WebKit/Source/core/css/StyleSheetContents.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 14 matching lines @@
 #include "core/css/StyleRule.h"
 #include "core/css/StyleRuleImport.h"
 #include "core/css/StyleRuleNamespace.h"
 #include "core/css/parser/CSSParser.h"
 #include "core/dom/Document.h"
 #include "core/dom/Node.h"
 #include "core/dom/StyleEngine.h"
 #include "core/fetch/CSSStyleSheetResource.h"
 #include "core/frame/UseCounter.h"
 #include "core/inspector/InspectorTraceEvents.h"
+#include "platform/Histogram.h"
 #include "platform/TraceEvent.h"
 #include "platform/weborigin/SecurityOrigin.h"
 
 namespace blink {
 
 // Rough size estimate for the memory cache.
 unsigned StyleSheetContents::estimatedSizeInBytes() const
 {
     // Note that this does not take into account size of the strings hanging from various objects.
     // The assumption is that nearly all of of them are atomic and would exist anyway.
@@ skipping 267 matching lines @@
 }
 
 const AtomicString& StyleSheetContents::namespaceURIFromPrefix(const AtomicString& prefix)
 {
     return m_namespaces.get(prefix);
 }
 
 void StyleSheetContents::parseAuthorStyleSheet(const CSSStyleSheetResource* cachedStyleSheet, const SecurityOrigin* securityOrigin)
 {
     TRACE_EVENT1("blink,devtools.timeline", "ParseAuthorStyleSheet", "data", InspectorParseAuthorStyleSheetEvent::data(cachedStyleSheet));
+    SCOPED_BLINK_UMA_HISTOGRAM_TIMER("Style.AuthorStyleSheet.ParseTime");
 
     bool isSameOriginRequest = securityOrigin && securityOrigin->canRequest(baseURL());
 
     // When the response was fetched via the Service Worker, the original URL may not be same as the base URL.
     // TODO(horo): When we will use the original URL as the base URL, we can remove this check. crbug.com/553535
     if (cachedStyleSheet->response().wasFetchedViaServiceWorker()) {
         const KURL originalURL(cachedStyleSheet->response().originalURLViaServiceWorker());
         // |originalURL| is empty when the response is created in the SW.
         if (!originalURL.isEmpty() && !securityOrigin->canRequest(originalURL))
             isSameOriginRequest = false;
@@ skipping 332 matching lines @@
     visitor->trace(m_importRules);
     visitor->trace(m_namespaceRules);
     visitor->trace(m_childRules);
     visitor->trace(m_loadingClients);
     visitor->trace(m_completedClients);
     visitor->trace(m_ruleSet);
     visitor->trace(m_referencedFromResource);
 }
 
 } // namespace blink