Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/html/track/TextTrack.cpp

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2011, 2012, 2013 Apple 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.
@@ skipping 30 matching lines @@
 #include "core/html/track/vtt/VTTRegion.h"
 #include "core/html/track/vtt/VTTRegionList.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
 static const int invalidTrackIndex = -1;
 
 const AtomicString& TextTrack::subtitlesKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, subtitles, ("subtitles", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, subtitles, ("subtitles"));
     return subtitles;
 }
 
 const AtomicString& TextTrack::captionsKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, captions, ("captions", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, captions, ("captions"));
     return captions;
 }
 
 const AtomicString& TextTrack::descriptionsKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, descriptions, ("descriptions", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, descriptions, ("descriptions"));
     return descriptions;
 }
 
 const AtomicString& TextTrack::chaptersKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, chapters, ("chapters", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, chapters, ("chapters"));
     return chapters;
 }
 
 const AtomicString& TextTrack::metadataKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, metadata, ("metadata", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, metadata, ("metadata"));
     return metadata;
 }
 
 const AtomicString& TextTrack::disabledKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, open, ("disabled", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, open, ("disabled"));
     return open;
 }
 
 const AtomicString& TextTrack::hiddenKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, closed, ("hidden", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, closed, ("hidden"));
     return closed;
 }
 
 const AtomicString& TextTrack::showingKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, ended, ("showing", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, ended, ("showing"));
     return ended;
 }
 
 TextTrack::TextTrack(const AtomicString& kind, const AtomicString& label, const AtomicString& language, const AtomicString& id, TextTrackType type)
     : TrackBase(TrackBase::TextTrack, label, language, id)
     , m_cues(nullptr)
     , m_regions(nullptr)
     , m_trackList(nullptr)
     , m_mode(disabledKeyword())
     , m_trackType(type)
@@ skipping 369 matching lines @@
 {
     visitor->trace(m_cues);
     visitor->trace(m_activeCues);
     visitor->trace(m_regions);
     visitor->trace(m_trackList);
     TrackBase::trace(visitor);
     RefCountedGarbageCollectedEventTargetWithInlineData<TextTrack>::trace(visitor);
 }
 
 } // namespace blink