Suggested Articles can be dismissed

ios/chrome/browser/content_suggestions/content_suggestions_coordinator.mm

Index: ios/chrome/browser/content_suggestions/content_suggestions_coordinator.mm
diff --git a/ios/chrome/browser/content_suggestions/content_suggestions_coordinator.mm b/ios/chrome/browser/content_suggestions/content_suggestions_coordinator.mm
index 5104b68a259a490fc94e029c46cc2b7493508d32..e0cf332a3e43234af723a7f7157e764fbed72d60 100644
--- a/ios/chrome/browser/content_suggestions/content_suggestions_coordinator.mm
+++ b/ios/chrome/browser/content_suggestions/content_suggestions_coordinator.mm
@@ -6,9 +6,12 @@
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
+#include "components/ntp_snippets/content_suggestions_service.h"
+#include "components/ntp_snippets/remote/remote_suggestions_scheduler.h"
 #import "ios/chrome/browser/content_suggestions/content_suggestions_mediator.h"
 #include "ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.h"
 #import "ios/chrome/browser/ui/alert_coordinator/action_sheet_coordinator.h"
+#import "ios/chrome/browser/ui/content_suggestions/content_suggestion_identifier.h"
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_article_item.h"
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_commands.h"
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.h"
@@ -22,16 +25,21 @@
 #error "This file requires ARC support."
 #endif
 
-@interface ContentSuggestionsCoordinator ()<ContentSuggestionsCommands> {
-  ContentSuggestionsMediator* _contentSuggestionsMediator;
-}
+@interface ContentSuggestionsCoordinator ()<ContentSuggestionsCommands>
 
 @property(nonatomic, strong) AlertCoordinator* alertCoordinator;
 @property(nonatomic, strong) UINavigationController* navigationController;
 @property(nonatomic, strong)
     ContentSuggestionsViewController* suggestionsViewController;
+@property(nonatomic, strong)
+    ContentSuggestionsMediator* contentSuggestionsMediator;
 
+// Opens the |URL| in a new tab |incognito| or not.
 - (void)openNewTabWithURL:(const GURL&)URL incognito:(BOOL)incognito;
+// Dismisses the |article|, removing it from the content service, and dismisses
+// the item at |indexPath| in the view controller.
+- (void)dismissArticle:(ContentSuggestionsArticleItem*)article
+           atIndexPath:(NSIndexPath*)indexPath;
 
 @end
 
@@ -43,6 +51,7 @@
 @synthesize suggestionsViewController = _suggestionsViewController;
 @synthesize URLLoader = _URLLoader;
 @synthesize visible = _visible;
+@synthesize contentSuggestionsMediator = _contentSuggestionsMediator;
 
 - (void)start {
   if (self.visible || !self.browserState) {
@@ -53,13 +62,17 @@
 
   _visible = YES;
 
-  _contentSuggestionsMediator = [[ContentSuggestionsMediator alloc]
-      initWithContentService:IOSChromeContentSuggestionsServiceFactory::
-                                 GetForBrowserState(self.browserState)];
+  ntp_snippets::ContentSuggestionsService* contentSuggestionsService =
+      IOSChromeContentSuggestionsServiceFactory::GetForBrowserState(
+          self.browserState);
+  contentSuggestionsService->remote_suggestions_scheduler()->OnNTPOpened();
+
+  self.contentSuggestionsMediator = [[ContentSuggestionsMediator alloc]
+      initWithContentService:contentSuggestionsService];
 
   self.suggestionsViewController = [[ContentSuggestionsViewController alloc]
       initWithStyle:CollectionViewControllerStyleDefault
-         dataSource:_contentSuggestionsMediator];
+         dataSource:self.contentSuggestionsMediator];
 
   self.suggestionsViewController.suggestionCommandHandler = self;
   _navigationController = [[UINavigationController alloc]
@@ -82,6 +95,7 @@
       dismissViewControllerAnimated:YES
                          completion:nil];
   self.navigationController = nil;
+  self.contentSuggestionsMediator = nil;
   _visible = NO;
 }
 
@@ -108,7 +122,8 @@
 }
 
 - (void)displayContextMenuForArticle:(ContentSuggestionsArticleItem*)articleItem
-                             atPoint:(CGPoint)touchLocation {
+                             atPoint:(CGPoint)touchLocation
+                         atIndexPath:(NSIndexPath*)indexPath {
   NSString* urlString = base::SysUTF8ToNSString(articleItem.articleURL.spec());
   self.alertCoordinator = [[ActionSheetCoordinator alloc]
       initWithBaseViewController:self.navigationController
@@ -120,6 +135,7 @@
 
   __weak ContentSuggestionsCoordinator* weakSelf = self;
   GURL articleURL = articleItem.articleURL;
+  __weak ContentSuggestionsArticleItem* weakArticle = articleItem;
 
   NSString* openInNewTabTitle =
       l10n_util::GetNSString(IDS_IOS_CONTENT_CONTEXT_OPENLINKNEWTAB);
@@ -146,7 +162,8 @@
   [self.alertCoordinator addItemWithTitle:deleteTitle
                                    action:^{
                                      // TODO(crbug.com/691979): Add metrics.
-                                     [weakSelf removeEntry];
+                                     [weakSelf dismissArticle:weakArticle
+                                                  atIndexPath:indexPath];
                                    }
                                     style:UIAlertActionStyleDefault];
 
@@ -173,8 +190,15 @@
   [self stop];
 }
 
-- (void)removeEntry {
+- (void)dismissArticle:(ContentSuggestionsArticleItem*)article
+           atIndexPath:(NSIndexPath*)indexPath {
+  if (!article)
+    return;
+
   // TODO(crbug.com/691979): Add metrics.
+  [self.contentSuggestionsMediator
+      dismissSuggestion:article.suggestionIdentifier];
+  [self.suggestionsViewController dismissEntryAtIndexPath:indexPath];
 }
 
 @end