Issue 5137 - [emscripten] Added basic filter storage implementation

compiled/subscription/Subscription.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 65 matching lines @@
   Type mType;
 
   EMSCRIPTEN_KEEPALIVE const String& GetID() const
   {
     return mID;
   }
 
   SUBSCRIPTION_STRING_PROPERTY(mTitle, SUBSCRIPTION_TITLE, GetTitle, SetTitle);
   SUBSCRIPTION_PROPERTY(bool, mDisabled, SUBSCRIPTION_DISABLED,
         GetDisabled, SetDisabled);
+  SUBSCRIPTION_PROPERTY(bool, mListed, NONE, GetListed, SetListed);
 
   EMSCRIPTEN_KEEPALIVE unsigned GetFilterCount() const
   {
     return mFilters.size();
   }
 
   EMSCRIPTEN_KEEPALIVE Filter* FilterAt(unsigned index);
   EMSCRIPTEN_KEEPALIVE int IndexOfFilter(Filter* filter);
   EMSCRIPTEN_KEEPALIVE OwnedString Serialize() const;
   EMSCRIPTEN_KEEPALIVE OwnedString SerializeFilters() const;
 
   static EMSCRIPTEN_KEEPALIVE Subscription* FromID(const String& id);
+
+  template<typename T>
+  T* As();
 };
 
 typedef intrusive_ptr<Subscription> SubscriptionPtr;