[WIP] bindings: Introduce PropertyBag

Source/bindings/core/v8/V8Binding.cpp

Index: Source/bindings/core/v8/V8Binding.cpp
diff --git a/Source/bindings/core/v8/V8Binding.cpp b/Source/bindings/core/v8/V8Binding.cpp
index b1e36c0770e75469d2b5ca77c8109eb2dabbcc69..46def6dbe4080bc6520aa5ee1c8c6f2899b41063 100644
--- a/Source/bindings/core/v8/V8Binding.cpp
+++ b/Source/bindings/core/v8/V8Binding.cpp
@@ -466,10 +466,21 @@ uint64_t toUInt64(v8::Handle<v8::Value> value)
 
 float toFloat(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
 {
+    return static_cast<float>(toDouble(value, exceptionState));
+}
+
+double toDouble(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
+{
     TONATIVE_DEFAULT_EXCEPTIONSTATE(v8::Local<v8::Number>, numberObject, value->ToNumber(), exceptionState, 0);
     return numberObject->NumberValue();
 }
 
+bool toBoolean(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
+{
+    TONATIVE_DEFAULT_EXCEPTIONSTATE(v8::Local<v8::Boolean>, booleanObject, value->ToBoolean(), exceptionState, false);
+    return booleanObject->Value();
+}
+
 String toByteString(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
 {
     // Handle null default value.