IOS Reading distillation: Handle Google AMP iFrame.

ios/chrome/browser/reading_list/reading_list_distiller_page.h

Index: ios/chrome/browser/reading_list/reading_list_distiller_page.h
diff --git a/ios/chrome/browser/reading_list/reading_list_distiller_page.h b/ios/chrome/browser/reading_list/reading_list_distiller_page.h
index 0678a91bafb1e057f287a71d376eb42648ebf46d..f2e1bb927be8495a298ec32c8eb0bb3a38a2c655 100644
--- a/ios/chrome/browser/reading_list/reading_list_distiller_page.h
+++ b/ios/chrome/browser/reading_list/reading_list_distiller_page.h
@@ -37,8 +37,19 @@ class ReadingListDistillerPage : public dom_distiller::DistillerPageIOS {
       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.
+  // IsGoogleCachedAMP will determine if the current page is a Google AMP page.
+  bool IsGoogleCachedAMP();
+  // HandleGoogleCachedAMP will navigate to the iframe containing the actual
+  // article page.
+  bool HandleGoogleCachedAMP();
+  bool HandleGoogleCachedAMPJavaScriptResult(id result, NSError* error);
+
+  void WaitForPageLoadCompletion();
+  void DelayedOnLoadURLDone();
   FaviconWebStateDispatcher* web_state_dispatcher_;
   base::WeakPtrFactory<ReadingListDistillerPage> weak_ptr_factory_;
 };