[bindings] Introduce ScriptValue.to<T> to convert to native values.

Source/bindings/core/v8/V8Binding.h

 /*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * Copyright (C) 2012 Ericsson AB. 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 786 matching lines @@
     uint32_t sequenceLength = lengthValue->Int32Value();
     if (block.HasCaught()) {
         exceptionState.rethrowV8Exception(block.Exception());
         return false;
     }
 
     length = sequenceLength;
     return true;
 }
 
+template <typename T>
+T script_value_cast(const v8::Local<v8::Value>& value, v8::Isolate* isolate, ExceptionState& exceptionState)

[haraken, 2015/03/14 01:27:19]

Why does this need to be defined in V8Binding.h? Can we put this in
ScriptValue.h?

+{
+    return NativeValueTraits<T>::nativeValue(value, isolate, exceptionState);
+}
+
 template<>
 struct NativeValueTraits<String> {
     static inline String nativeValue(const v8::Local<v8::Value>& value, v8::Isolate* isolate, ExceptionState& exceptionState)
     {
         V8StringResource<> stringValue(value);
         if (!stringValue.prepare(exceptionState))
             return String();
         return stringValue;
     }
 };
@@ skipping 207 matching lines @@
 
 // Callback functions used by generated code.
 void v8ConstructorAttributeGetterAsProperty(v8::Local<v8::String> propertyName, const v8::PropertyCallbackInfo<v8::Value>&);
 void v8ConstructorAttributeGetterAsAccessor(const v8::FunctionCallbackInfo<v8::Value>&);
 
 typedef void (*InstallTemplateFunction)(v8::Local<v8::FunctionTemplate>, v8::Isolate*);
 
 } // namespace blink
 
 #endif // V8Binding_h