Pass more information by argument to the dom_distiller script.

components/dom_distiller/ios/distiller_page_ios.h

Index: components/dom_distiller/ios/distiller_page_ios.h
diff --git a/components/dom_distiller/ios/distiller_page_ios.h b/components/dom_distiller/ios/distiller_page_ios.h
index 11e4aae99894236c52e4c0d4e75492fd5602e21c..d608cd775c0084478497269ff2a16532e7fcc386 100644
--- a/components/dom_distiller/ios/distiller_page_ios.h
+++ b/components/dom_distiller/ios/distiller_page_ios.h
@@ -33,12 +33,14 @@ class DistillerPageIOS : public DistillerPage {
   explicit DistillerPageIOS(web::BrowserState* browser_state);
   ~DistillerPageIOS() override;
 
+ protected:
+  bool StringifyOutput() override;
+  bool CreateNewContext() override;
+  void DistillPageImpl(const GURL& url, const std::string& script) override;
+
  private:
   friend class DistillerWebStateObserver;
 
-  // DistillerPage implementation:
-  void DistillPageImpl(const GURL& url, const std::string& script) override;
-
   // Called by |web_state_observer_| once the page has finished loading.
   void OnLoadURLDone(web::PageLoadCompletionStatus load_completion_status);