IOS Reading distillation: Handle Google AMP iFrame.

components/dom_distiller/ios/distiller_page_ios.mm

Index: components/dom_distiller/ios/distiller_page_ios.mm
diff --git a/components/dom_distiller/ios/distiller_page_ios.mm b/components/dom_distiller/ios/distiller_page_ios.mm
index 84361339a743b2a35ea84d22e86d33009599946a..389d16161b1b5e387ef8efe0490ca907c85eeeeb 100644
--- a/components/dom_distiller/ios/distiller_page_ios.mm
+++ b/components/dom_distiller/ios/distiller_page_ios.mm
@@ -163,6 +163,10 @@ std::unique_ptr<web::WebState> DistillerPageIOS::DetachWebState() {
   return old_web_state;
 }
 
+web::WebState* DistillerPageIOS::CurrentWebState() {
+  return web_state_.get();
+}
+
 void DistillerPageIOS::DistillPageImpl(const GURL& url,
                                        const std::string& script) {
   if (!url.is_valid() || !script.length())