[bindings] Split toUInt64 into fast inline vs slow non-inline code paths.

Source/bindings/core/v8/V8Binding.h

Index: Source/bindings/core/v8/V8Binding.h
diff --git a/Source/bindings/core/v8/V8Binding.h b/Source/bindings/core/v8/V8Binding.h
index 73270d981dd48c399bd09c99e2e38445940aa3f8..69847658805361bcbb6cdca1ef169d84ce3daa8a 100644
--- a/Source/bindings/core/v8/V8Binding.h
+++ b/Source/bindings/core/v8/V8Binding.h
@@ -477,10 +477,23 @@ inline int64_t toInt64(v8::Handle<v8::Value> value, ExceptionState& exceptionSta
 // Convert a value to a 64-bit integer assuming the conversion cannot fail.
 int64_t toInt64(v8::Handle<v8::Value>);
 
+CORE_EXPORT uint64_t toUInt64Slow(v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
+
 // Convert a value to a 64-bit unsigned integer. The conversion fails if the
 // value cannot be converted to a number or the range violated per WebIDL:
 // http://www.w3.org/TR/WebIDL/#es-unsigned-long-long
-CORE_EXPORT uint64_t toUInt64(v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
+inline uint64_t toUInt64(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
+{
+    // Fast case. The value is a 32-bit unsigned integer.
+    if (value->IsUint32())
+        return value->Uint32Value();
+
+    if (value->IsInt32() && configuration == NormalConversion)
+        return value->Int32Value();
+
+    return toUInt64Slow(value, configuration, exceptionState);
+}
+
 inline uint64_t toUInt64(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
 {
     return toUInt64(value, NormalConversion, exceptionState);