Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/html/track/vtt/VTTRegion.cpp

 /*
  * Copyright (C) 2013 Google Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 138 matching lines @@
 void VTTRegion::setViewportAnchorY(double value, ExceptionState& exceptionState)
 {
     if (isNonPercentage(value, "viewportAnchorY", exceptionState))
         return;
 
     m_viewportAnchor.setY(value);
 }
 
 const AtomicString VTTRegion::scroll() const
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, upScrollValueKeyword, ("up", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, upScrollValueKeyword, ("up"));
 
     if (m_scroll)
         return upScrollValueKeyword;
 
     return "";
 }
 
 void VTTRegion::setScroll(const AtomicString& value, ExceptionState& exceptionState)
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, upScrollValueKeyword, ("up", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, upScrollValueKeyword, ("up"));
 
     if (value != emptyString() && value != upScrollValueKeyword) {
         exceptionState.throwDOMException(SyntaxError, "The value provided ('" + value + "') is invalid. The 'scroll' property must be either the empty string, or 'up'.");
         return;
     }
 
     m_scroll = value == upScrollValueKeyword;
 }
 
 void VTTRegion::updateParametersFromRegion(VTTRegion* region)
@@ skipping 51 matching lines @@
     return None;
 }
 
 static inline bool parsedEntireRun(const VTTScanner& input, const VTTScanner::Run& run)
 {
     return input.isAt(run.end());
 }
 
 void VTTRegion::parseSettingValue(RegionSetting setting, VTTScanner& input)
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, scrollUpValueKeyword, ("up", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, scrollUpValueKeyword, ("up"));
 
     VTTScanner::Run valueRun = input.collectUntil<VTTParser::isASpace>();
 
     switch (setting) {
     case Id: {
         String stringValue = input.extractString(valueRun);
         if (stringValue.find("-->") == kNotFound)
             m_id = stringValue;
         break;
     }
@@ skipping 38 matching lines @@
     case None:
         break;
     }
 
     input.skipRun(valueRun);
 }
 
 const AtomicString& VTTRegion::textTrackCueContainerShadowPseudoId()
 {
     DEFINE_STATIC_LOCAL(const AtomicString, trackRegionCueContainerPseudoId,
-        ("-webkit-media-text-track-region-container", AtomicString::ConstructFromLiteral));
+        ("-webkit-media-text-track-region-container"));
 
     return trackRegionCueContainerPseudoId;
 }
 
 const AtomicString& VTTRegion::textTrackCueContainerScrollingClass()
 {
     DEFINE_STATIC_LOCAL(const AtomicString, trackRegionCueContainerScrollingClass,
-        ("scrolling", AtomicString::ConstructFromLiteral));
+        ("scrolling"));
 
     return trackRegionCueContainerScrollingClass;
 }
 
 const AtomicString& VTTRegion::textTrackRegionShadowPseudoId()
 {
     DEFINE_STATIC_LOCAL(const AtomicString, trackRegionShadowPseudoId,
-        ("-webkit-media-text-track-region", AtomicString::ConstructFromLiteral));
+        ("-webkit-media-text-track-region"));
 
     return trackRegionShadowPseudoId;
 }
 
 PassRefPtrWillBeRawPtr<HTMLDivElement> VTTRegion::getDisplayTree(Document& document)
 {
     if (!m_regionDisplayTree) {
         m_regionDisplayTree = HTMLDivElement::create(document);
         prepareRegionDisplayTree();
     }
@@ skipping 142 matching lines @@
 }
 
 DEFINE_TRACE(VTTRegion)
 {
     visitor->trace(m_cueContainer);
     visitor->trace(m_regionDisplayTree);
     visitor->trace(m_track);
 }
 
 } // namespace blink