Avoid string allocation when parsing CSSPrimitiveValue::UnitType

third_party/WebKit/Source/core/css/cssom/CSSAngleValue.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/cssom/CSSAngleValue.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/css/CSSPrimitiveValue.h"
+#include "core/css/CSSPrimitiveValueUnitTrie.h"
 #include "wtf/MathExtras.h"
 
 namespace blink {
 
 CSSAngleValue* CSSAngleValue::create(double value, const String& unit, ExceptionState& exceptionState)
 {
-    CSSPrimitiveValue::UnitType primitiveUnit = CSSPrimitiveValue::fromName(unit);
+    CSSPrimitiveValue::UnitType primitiveUnit;
+    if (unit.is8Bit())
+        primitiveUnit = lookupCSSPrimitiveValueUnit(unit.characters8(), unit.length());
+    else
+        primitiveUnit = lookupCSSPrimitiveValueUnit(unit.characters16(), unit.length());
     DCHECK(CSSPrimitiveValue::isAngle(primitiveUnit));
     return new CSSAngleValue(value, primitiveUnit);
 }
 
 double CSSAngleValue::degrees() const
 {
     switch (m_unit) {
     case CSSPrimitiveValue::UnitType::Degrees:
         return m_value;
     case CSSPrimitiveValue::UnitType::Radians:
@@ skipping 22 matching lines @@
 {
     return deg2turn(degrees());
 }
 
 CSSValue* CSSAngleValue::toCSSValue() const
 {
     return cssValuePool().createValue(m_value, m_unit);
 }
 
 } // namespace blink