Validation of extension api callback and event parameters in DEBUG

chrome/renderer/extensions/bindings_utils.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_BINDINGS_UTILS_H_
 #define CHROME_RENDERER_EXTENSIONS_BINDINGS_UTILS_H_
 
 #include "app/resource_bundle.h"
 #include "base/linked_ptr.h"
 #include "base/singleton.h"
@@ skipping 88 matching lines @@
 
 // Returns a mutable reference to the PendingRequestMap.
 PendingRequestMap& GetPendingRequestMap();
 
 // Returns the current RenderView, based on which V8 context is current.  It is
 // an error to call this when not in a V8 context.
 RenderView* GetRenderViewForCurrentContext();
 
 // Call the named javascript function with the given arguments in a context.
 // The function name should be reachable from the chromeHidden object, and can
-// be a sub-property like "Port.dispatchOnMessage".
-void CallFunctionInContext(v8::Handle<v8::Context> context,
-                           const std::string& function_name, int argc,
-                           v8::Handle<v8::Value>* argv);
+// be a sub-property like "Port.dispatchOnMessage". Returns the result of 
+// the function call. If an exception is thrown an empty Handle will be
+// returned.
+v8::Handle<v8::Value> CallFunctionInContext(v8::Handle<v8::Context> context,
+    const std::string& function_name, int argc,
+    v8::Handle<v8::Value>* argv);
 
 }  // namespace bindings_utils
 
 #endif  // CHROME_RENDERER_EXTENSIONS_BINDINGS_UTILS_H_