[ios] TabIdTabHelper

ios/chrome/browser/web/tab_id_tab_helper.h

Index: ios/chrome/browser/web/tab_id_tab_helper.h
diff --git a/ios/chrome/browser/web/tab_id_tab_helper.h b/ios/chrome/browser/web/tab_id_tab_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..8d68944e050bcbaf49d093d3f1eac9e81eea1330
--- /dev/null
+++ b/ios/chrome/browser/web/tab_id_tab_helper.h
@@ -0,0 +1,27 @@
+// 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.
+
+#ifndef IOS_CHROME_BROWSER_WEB_TAB_ID_TAB_HELPER_H_
+#define IOS_CHROME_BROWSER_WEB_TAB_ID_TAB_HELPER_H_
+
+#include "base/macros.h"
+#import "ios/web/public/web_state/web_state_user_data.h"
+
+// Handles creating a unique identifier, which is stable across cold starts.
+class TabIDTabHelper : public web::WebStateUserData<TabIDTabHelper> {
+ public:
+  ~TabIDTabHelper() override;
+
+  // Returns a unique identifier for this tab.
+  NSString* tab_id() const { return tab_id_; }
+
+ private:
+  explicit TabIDTabHelper(web::WebState* web_state);
+  friend class web::WebStateUserData<TabIDTabHelper>;
+  NSString* tab_id_;

[sdefresne, 2017/06/23 16:57:03]

__strong NSString* tab_id_;

[edchin, 2017/06/23 22:40:09]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(TabIDTabHelper);
+};
+
+#endif  // IOS_CHROME_BROWSER_WEB_TAB_ID_TAB_HELPER_H_