Add an ID to the ContentSuggestion

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

Index: ios/chrome/browser/ui/content_suggestions/content_suggestion_identifier.mm
diff --git a/ios/chrome/browser/ui/content_suggestions/content_suggestion_identifier.mm b/ios/chrome/browser/ui/content_suggestions/content_suggestion_identifier.mm
new file mode 100644
index 0000000000000000000000000000000000000000..b3ad566c80bec7bc1d258252ec9507b208b3efbc
--- /dev/null
+++ b/ios/chrome/browser/ui/content_suggestions/content_suggestion_identifier.mm
@@ -0,0 +1,36 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/chrome/browser/ui/content_suggestions/content_suggestion_identifier.h"
+
+#include "base/mac/foundation_util.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation ContentSuggestionIdentifier
+
+@synthesize sectionInfo = _sectionInfo;
+@synthesize IDInSection = _IDInSection;
+
+#pragma mark - NSObject
+
+- (BOOL)isEqual:(id)object {
+  if (self == object) {
+    return YES;
+  }
+
+  if (![object isKindOfClass:[ContentSuggestionIdentifier class]]) {
+    return NO;
+  }
+
+  ContentSuggestionIdentifier* other =
+      base::mac::ObjCCastStrict<ContentSuggestionIdentifier>(object);
+
+  return self.sectionInfo == other.sectionInfo &&
+         self.IDInSection == other.IDInSection;
+}
+
+@end