chakrashim: Implemented 2 new nan.h APIs

Added below 2 new nan.h APIs of version 2.12
- SetCallHandler
- SetCallAsFunctionHandler

Reviewed-By: @munyirik

deps/chakrashim/include/v8.h

@@ -1794,6 +1794,8 @@ class V8_EXPORT FunctionTemplate : public Template {
   Local<ObjectTemplate> PrototypeTemplate();
   void SetClassName(Handle<String> name);
   void SetHiddenPrototype(bool value);
+  void SetCallHandler(FunctionCallback callback,
+                      Handle<Value> data = Handle<Value>());
   bool HasInstance(Handle<Value> object);
   void Inherit(Handle<FunctionTemplate> parent);
 };
@@ -1908,6 +1910,8 @@ class V8_EXPORT ObjectTemplate : public Template {
     bool turned_on_by_default = true);
 
   void SetInternalFieldCount(int value);
+  void SetCallAsFunctionHandler(FunctionCallback callback,
+                                Handle<Value> data = Handle<Value>());
 
  private:
   friend struct FunctionCallbackData;

deps/chakrashim/src/v8functiontemplate.cc

@@ -327,6 +327,25 @@ void FunctionTemplate::SetHiddenPrototype(bool value) {
   // CHAKRA-TODO
 }
 
+void FunctionTemplate::SetCallHandler(FunctionCallback callback,
+                                      Handle<Value> data) {
+  void* externalData;
+  if (JsGetExternalData(this, &externalData) != JsNoError) {
+    return;
+  }
+
+  FunctionCallbackData* callbackData =
+    new FunctionCallbackData(callback, data, Handle<Signature>());
+  FunctionTemplateData *functionTemplateData =
+    reinterpret_cast<FunctionTemplateData*>(externalData);
+
+  // delete old callbackData explictly
+  if (functionTemplateData->callbackData != nullptr) {
+    delete functionTemplateData->callbackData;
+  }
+  functionTemplateData->callbackData = callbackData;
+}
+
 bool FunctionTemplate::HasInstance(Handle<Value> object) {
   return jsrt::InstanceOf(*object, *GetFunction());
 }

deps/chakrashim/src/v8objecttemplate.cc

@@ -39,6 +39,8 @@ struct ObjectTemplateData : public TemplateData {
   IndexedPropertyDeleterCallback indexedPropertyDeleter;
   IndexedPropertyEnumeratorCallback indexedPropertyEnumerator;
   Persistent<Value> indexedPropertyInterceptorData;
+  FunctionCallback functionCallDelegate;
+  Persistent<Value> functionCallDelegateInterceptorData;
   int internalFieldCount;
 
   ObjectTemplateData()
@@ -52,6 +54,8 @@ struct ObjectTemplateData : public TemplateData {
         indexedPropertyQuery(nullptr),
         indexedPropertyDeleter(nullptr),
         indexedPropertyEnumerator(nullptr),
+        functionCallDelegate(nullptr),
+        functionCallDelegateInterceptorData(nullptr),
         internalFieldCount(0) {
     HandleScope scope(nullptr);
     properties = Object::New();
@@ -68,6 +72,10 @@ struct ObjectTemplateData : public TemplateData {
       indexedPropertyGetter != nullptr ||
       indexedPropertyQuery != nullptr ||
       indexedPropertySetter != nullptr;
+    /*
+    CHAKRA: functionCallDelegate is intentionaly not added as interceptors because it can be invoked
+    through Object::CallAsFunction or Object::CallAsConstructor
+    */
   }
 
   static void CALLBACK FinalizeCallback(void *data) {
@@ -1043,6 +1051,22 @@ void ObjectTemplate::SetAccessCheckCallbacks(
   // CHAKRA-TODO
 }
 
+void ObjectTemplate::SetCallAsFunctionHandler(
+    FunctionCallback callback,
+    Handle<Value> data) {
+    void* externalData;
+    if (JsGetExternalData(this, &externalData) != JsNoError)
+    {
+        return;
+    }
+
+    ObjectTemplateData *objectTemplateData =
+        reinterpret_cast<ObjectTemplateData*>(externalData);
+
+    objectTemplateData->functionCallDelegate = callback;
+    objectTemplateData->functionCallDelegateInterceptorData = data;
+}
+
 void ObjectTemplate::SetInternalFieldCount(int value) {
   void* externalData;
   if (JsGetExternalData(this, &externalData) != JsNoError) {