Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/build/scripts/make_css_property_names.py

 #!/usr/bin/env python
 
 import subprocess
 import sys
 
 import css_properties
 import in_generator
 import license
 
 
@@ skipping 121 matching lines @@
     int index = id - firstCSSProperty;
     return propertyNameStringsPool + propertyNameStringsOffsets[index];
 }
 
 const AtomicString& getPropertyNameAtomicString(CSSPropertyID id)
 {
     ASSERT(id >= firstCSSProperty && id <= lastUnresolvedCSSProperty);
     int index = id - firstCSSProperty;
     static AtomicString* propertyStrings = new AtomicString[lastUnresolvedCSSProperty]; // Intentionally never destroyed.
     AtomicString& propertyString = propertyStrings[index];
-    if (propertyString.isNull()) {
-        const char* propertyName = propertyNameStringsPool + propertyNameStringsOffsets[index];
-        propertyString = AtomicString(propertyName, strlen(propertyName), AtomicString::ConstructFromLiteral);
-    }
+    if (propertyString.isNull())
+        propertyString = AtomicString(propertyNameStringsPool + propertyNameStringsOffsets[index]);
     return propertyString;
 }
 
 String getPropertyNameString(CSSPropertyID id)
 {
     // We share the StringImpl with the AtomicStrings.
     return getPropertyNameAtomicString(id).getString();
 }
 
 String getJSPropertyName(CSSPropertyID id)
@@ skipping 75 matching lines @@
         # FIXME: If we could depend on Python 2.7, we would use subprocess.check_output
         gperf_args = [self.gperf_path, '--key-positions=*', '-P', '-n']
         gperf_args.extend(['-m', '50'])  # Pick best of 50 attempts.
         gperf_args.append('-D')  # Allow duplicate hashes -> More compact code.
         gperf = subprocess.Popen(gperf_args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, universal_newlines=True)
         return gperf.communicate(gperf_input)[0]
 
 
 if __name__ == "__main__":
     in_generator.Maker(CSSPropertyNamesWriter).main(sys.argv)