IOS Reading distillation: Handle Google AMP iFrame.

ios/chrome/browser/reading_list/reading_list_distiller_page.h

 // Copyright 2016 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 IOS_CHROME_BROWSER_READING_LIST_READING_LIST_DISTILLER_PAGE_H_
 #define IOS_CHROME_BROWSER_READING_LIST_READING_LIST_DISTILLER_PAGE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 19 matching lines @@
   ~ReadingListDistillerPage() override;
 
  protected:
   void DistillPageImpl(const GURL& url, const std::string& script) override;
   void OnDistillationDone(const GURL& page_url,
                           const base::Value* value) override;
   void OnLoadURLDone(
       web::PageLoadCompletionStatus load_completion_status) override;
 
  private:
-  void DelayedOnLoadURLDone(
-      web::PageLoadCompletionStatus load_completion_status);
+  // Work around the fact that articles opened from Google Search page and
+  // Google News are presented in an iframe. This method detects if the current
+  // page is a Google AMP and navigate to the iframe in that case.
+  // Returns whether the current page is a Google AMP page.
+  // IsGoogleCachedAMPPage will determine if the current page is a Google AMP
+  // page.
+  bool IsGoogleCachedAMPPage();
+  // HandleGoogleCachedAMPPage will navigate to the iframe containing the actual
+  // article page.
+  void HandleGoogleCachedAMPPage();
+  // Handles the JavaScript response. If the URL of the iframe is returned,
+  // triggers a navigation to it. Stop distillation of the page there as the new
+  // load will trigger a new distillation.
+  bool HandleGoogleCachedAMPPageJavaScriptResult(id result, NSError* error);
+
+  // Waits a delay then calls DelayedOnLoadURLDone.
+  void WaitForPageLoadCompletion();
+
+  // Continues distillation by calling superclass |OnLoadURLDone|.
+  void DelayedOnLoadURLDone();
+
   FaviconWebStateDispatcher* web_state_dispatcher_;
   base::WeakPtrFactory<ReadingListDistillerPage> weak_ptr_factory_;
 };
 
 }  // namespace reading_list
 
 #endif  // IOS_CHROME_BROWSER_READING_LIST_READING_LIST_DISTILLER_PAGE_H_