Made sure FilterEngine instances are always initialized

src/GlobalJsObject.cpp

Index: src/GlobalJsObject.cpp
===================================================================
--- a/src/GlobalJsObject.cpp
+++ b/src/GlobalJsObject.cpp
@@ -79,22 +79,29 @@ namespace
     }
     timeoutThread->Start();
 
     // We should actually return the timer ID here, which could be
     // used via clearTimeout(). But since we don't seem to need
     // clearTimeout(), we can save that for later.
     return v8::Undefined();
   }
+
+  v8::Handle<v8::Value> InitDoneCallback(const v8::Arguments& arguments)
+  {
+    AdblockPlus::JsEngine::FromArguments(arguments)->InitDone();
+    return v8::Undefined();
+  }
 }
 
 JsValuePtr GlobalJsObject::Setup(JsEnginePtr jsEngine, const AppInfo& appInfo,
     JsValuePtr obj)
 {
   obj->SetProperty("setTimeout", jsEngine->NewCallback(::SetTimeoutCallback));
+  obj->SetProperty("_initDone", jsEngine->NewCallback(::InitDoneCallback));
   obj->SetProperty("_fileSystem",
       FileSystemJsObject::Setup(jsEngine, jsEngine->NewObject()));
   obj->SetProperty("_webRequest",
       WebRequestJsObject::Setup(jsEngine, jsEngine->NewObject()));
   obj->SetProperty("console",
       ConsoleJsObject::Setup(jsEngine, jsEngine->NewObject()));
   obj->SetProperty("_appInfo",
       AppInfoJsObject::Setup(jsEngine, appInfo, jsEngine->NewObject()));