Extend API to allow setting length property for function templates.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index eb0b552f605dc196f0329cb4c8ed46c00304621b..b35500dd5e3712f843ad8847cef404a40eb0896a 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -2302,7 +2302,8 @@ class V8EXPORT FunctionTemplate : public Template {
   static Local<FunctionTemplate> New(
       InvocationCallback callback = 0,
       Handle<Value> data = Handle<Value>(),
-      Handle<Signature> signature = Handle<Signature>());
+      Handle<Signature> signature = Handle<Signature>(),
+      int length = 0);
   /** Returns the unique function instance in the current execution context.*/
   Local<Function> GetFunction();
 
@@ -2314,6 +2315,9 @@ class V8EXPORT FunctionTemplate : public Template {
   void SetCallHandler(InvocationCallback callback,
                       Handle<Value> data = Handle<Value>());
 
+  /** Set the predefined length property for the FunctionTemplate. */
+  void SetLength(int length);
+
   /** Get the InstanceTemplate. */
   Local<ObjectTemplate> InstanceTemplate();
 
@@ -2326,7 +2330,6 @@ class V8EXPORT FunctionTemplate : public Template {
    */
   Local<ObjectTemplate> PrototypeTemplate();
 
-
   /**
    * Set the class name of the FunctionTemplate.  This is used for
    * printing objects created with the function created from the