Implementing sign-in promo histograms for bookmark

ios/chrome/browser/ui/bookmarks/bookmark_collection_view.mm

Index: ios/chrome/browser/ui/bookmarks/bookmark_collection_view.mm
diff --git a/ios/chrome/browser/ui/bookmarks/bookmark_collection_view.mm b/ios/chrome/browser/ui/bookmarks/bookmark_collection_view.mm
index 28cc755dbb44cc7bc27c3d588966e6491437fb92..11e140ddd099b8b89a8188d5654f99d3e7c94e88 100644
--- a/ios/chrome/browser/ui/bookmarks/bookmark_collection_view.mm
+++ b/ios/chrome/browser/ui/bookmarks/bookmark_collection_view.mm
@@ -19,10 +19,12 @@
 #include "components/favicon/core/large_icon_service.h"
 #include "components/favicon_base/fallback_icon_style.h"
 #include "components/favicon_base/favicon_types.h"
+#include "components/pref_registry/pref_registry_syncable.h"
 #include "ios/chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "ios/chrome/browser/bookmarks/bookmarks_utils.h"
 #include "ios/chrome/browser/experimental_flags.h"
 #include "ios/chrome/browser/favicon/ios_chrome_large_icon_service_factory.h"
+#include "ios/chrome/browser/pref_names.h"
 #import "ios/chrome/browser/ui/authentication/signin_promo_view.h"
 #import "ios/chrome/browser/ui/authentication/signin_promo_view_configurator.h"
 #import "ios/chrome/browser/ui/authentication/signin_promo_view_consumer.h"
@@ -142,6 +144,11 @@ const NSTimeInterval kShowEmptyBookmarksBackgroundRefreshDelay = 1.0;
 @synthesize browserState = _browserState;
 @synthesize shadow = _shadow;
 
++ (void)registerBrowserStatePrefs:(user_prefs::PrefRegistrySyncable*)registry {
+  registry->RegisterIntegerPref(prefs::kIosBookmarkSigninPromoDisplayedCount,
+                                0);
+}
+
 #pragma mark - Initialization
 
 - (void)setupViews {
@@ -335,16 +342,32 @@ const NSTimeInterval kShowEmptyBookmarksBackgroundRefreshDelay = 1.0;
         _signinPromoViewMediator.consumer = nil;
         _signinPromoViewMediator = nil;
       } else {
-        _signinPromoViewMediator = [[SigninPromoViewMediator alloc] init];
+        _signinPromoViewMediator = [[SigninPromoViewMediator alloc]
+            initWithBrowserState:_browserState];
         _signinPromoViewMediator.consumer = self;
+        _signinPromoViewMediator.displayedCountPreferenceKey =
+            prefs::kIosBookmarkSigninPromoDisplayedCount;
+        _signinPromoViewMediator.alreadySeenSigninViewPreferenceKey =
+            prefs::kIosBookmarkPromoAlreadySeen;
+        _signinPromoViewMediator.histograms =
+            ios::SigninPromoViewHistograms::Bookmarks;
         _signinPromoViewMediator.accessPoint =
             signin_metrics::AccessPoint::ACCESS_POINT_BOOKMARK_MANAGER;
+        [_signinPromoViewMediator signinPromoViewVisible];
       }
     }
     [self.collectionView reloadData];
   }
 }
 
+- (void)wasShown {
+  [_signinPromoViewMediator signinPromoViewVisible];
+}
+
+- (void)wasHidden {
+  [_signinPromoViewMediator signinPromoViewHidden];
+}
+
 #pragma mark - Sections
 
 - (NSInteger)promoSection {
@@ -773,7 +796,7 @@ const NSTimeInterval kShowEmptyBookmarksBackgroundRefreshDelay = 1.0;
           configureSigninPromoView:signinPromoCell.signinPromoView];
       __weak BookmarkCollectionView* weakSelf = self;
       signinPromoCell.closeButtonAction = ^() {
-        [weakSelf.delegate bookmarkCollectionViewDismissPromo:self];
+        [weakSelf signinPromoCloseButtonAction];
       };
       return signinPromoCell;
     } else {
@@ -794,6 +817,12 @@ const NSTimeInterval kShowEmptyBookmarksBackgroundRefreshDelay = 1.0;
   return cell;
 }
 
+// Removes the sign-in promo view.
+- (void)signinPromoCloseButtonAction {
+  [_signinPromoViewMediator signinPromoViewDismissed];
+  [_delegate bookmarkCollectionViewDismissPromo:self];
+}
+
 // Create a header view for the element at |indexPath|.
 - (UICollectionReusableView*)headerAtIndexPath:(NSIndexPath*)indexPath {
   if (![self needsSectionHeaderForSection:indexPath.section])