[ios] Calls refreshFeed on NTP reload.

Bug: 1085419
Change-Id: Ic038ca854016a3d2ad460ab1133527bedbd0ff78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343636
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796178}

ios/chrome/browser/ui/content_suggestions/content_suggestions_coordinator.mm

@@ -502,6 +502,8 @@
 }
 
 - (void)reload {
+  if (IsDiscoverFeedEnabled())
+    ios::GetChromeBrowserProvider()->GetDiscoverFeedProvider()->RefreshFeed();
   [self.contentSuggestionsMediator.dataSink reloadAllData];
 }
 

ios/public/provider/chrome/browser/discover_feed/discover_feed_provider.h

@@ -42,7 +42,11 @@ class DiscoverFeedProvider {
       NS_RETURNS_RETAINED;
   // Updates the feed's theme to match the user's theme (light/dark).
   virtual void UpdateTheme();
-  // Refreshes the Discover Feed with completion.
+  // Refreshes the Discover Feed. Once the Feed model is refreshed it will
+  // update all ViewControllers returned by NewFeedViewController.
+  virtual void RefreshFeed();
+  // DEPRECATED. Delete once https://crrev.com/i/3205705 lands, along
+  // base/ios/block_types.h
   virtual void RefreshFeedWithCompletion(ProceduralBlock completion);
   // Methods to register or remove observers.
   virtual void AddObserver(Observer* observer);

ios/public/provider/chrome/browser/discover_feed/discover_feed_provider.mm

@@ -19,6 +19,7 @@ UIViewController* DiscoverFeedProvider::NewFeedViewController(
 
 void DiscoverFeedProvider::UpdateTheme() {}
 
+void DiscoverFeedProvider::RefreshFeed() {}
 void DiscoverFeedProvider::RefreshFeedWithCompletion(
     ProceduralBlock completion) {}