Add toDouble() helper, and use toFloat()/toDouble() for conversions

Source/bindings/tests/results/core/V8TestInterface2.cpp

 // Copyright 2014 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.
 
 // This file has been auto-generated by code_generator_v8.py. DO NOT MODIFY!
 
 #include "config.h"
 #include "V8TestInterface2.h"
 
 #include "bindings/core/v8/ExceptionState.h"
@@ skipping 313 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void namedPropertySetter(v8::Local<v8::String> name, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     if (info.Holder()->HasRealNamedProperty(name))
         return;
     if (!info.Holder()->GetRealNamedPropertyInPrototypeChain(name).IsEmpty())
         return;
 
+    v8::String::Utf8Value namedProperty(name);
+    ExceptionState exceptionState(ExceptionState::SetterContext, *namedProperty, "TestInterface2", info.Holder(), info.GetIsolate());
     TestInterface2* impl = V8TestInterface2::toImpl(info.Holder());
     TOSTRING_VOID(V8StringResource<>, propertyName, name);
     TOSTRING_VOID(V8StringResource<>, propertyValue, v8Value);
-    v8::String::Utf8Value namedProperty(name);
-    ExceptionState exceptionState(ExceptionState::SetterContext, *namedProperty, "TestInterface2", info.Holder(), info.GetIsolate());
     bool result = impl->setNamedItem(propertyName, propertyValue, exceptionState);
     if (exceptionState.throwIfNeeded())
         return;
     if (!result)
         return;
     v8SetReturnValue(info, v8Value);
 }
 
 static void namedPropertySetterCallback(v8::Local<v8::String> name, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
@@ skipping 168 matching lines @@
     return 0;
 }
 
 template<>
 v8::Handle<v8::Value> toV8NoInline(TestInterface2* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     return toV8(impl, creationContext, isolate);
 }
 
 } // namespace blink