Add CSDataSource in showcase

ios/showcase/content_suggestions/sc_content_suggestions_coordinator.mm

Index: ios/showcase/content_suggestions/sc_content_suggestions_coordinator.mm
diff --git a/ios/showcase/content_suggestions/sc_content_suggestions_coordinator.mm b/ios/showcase/content_suggestions/sc_content_suggestions_coordinator.mm
index c4109ceb2ed559b514c180e5a1d8a0afdebf89e7..4e24a813a4712f0f05f8b13f324bad26b15f3347 100644
--- a/ios/showcase/content_suggestions/sc_content_suggestions_coordinator.mm
+++ b/ios/showcase/content_suggestions/sc_content_suggestions_coordinator.mm
@@ -7,6 +7,7 @@
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_commands.h"
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.h"
 #import "ios/showcase/common/protocol_alerter.h"
+#import "ios/showcase/content_suggestions/sc_content_suggestions_data_source.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
@@ -17,6 +18,7 @@
 @property(nonatomic, strong)
     ContentSuggestionsViewController* suggestionViewController;
 @property(nonatomic, strong) ProtocolAlerter* alerter;
+@property(nonatomic, strong) SCContentSuggestionsDataSource* dataSource;
 
 @end
 
@@ -25,6 +27,7 @@
 @synthesize baseViewController;
 @synthesize suggestionViewController = _suggestionViewController;
 @synthesize alerter = _alerter;
+@synthesize dataSource = _dataSource;
 
 #pragma mark - Coordinator
 
@@ -33,9 +36,11 @@
       initWithProtocols:@[ @protocol(ContentSuggestionsCommands) ]];
   self.alerter.baseViewController = self.baseViewController;
 
+  _dataSource = [[SCContentSuggestionsDataSource alloc] init];
+
   _suggestionViewController = [[ContentSuggestionsViewController alloc]
       initWithStyle:CollectionViewControllerStyleDefault
-         dataSource:nil];
+         dataSource:_dataSource];
 
   _suggestionViewController.suggestionCommandHandler =
       reinterpret_cast<id<ContentSuggestionsCommands>>(self.alerter);