Moved TabID implementation to SerializableUserData.

ios/chrome/browser/tabs/tab.mm

 // Copyright 2012 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/tabs/tab.h"
 
 #import <CoreLocation/CoreLocation.h>
 #import <UIKit/UIKit.h>
 
 #include <utility>
@@ skipping 115 matching lines @@
 #import "ios/public/provider/chrome/browser/native_app_launcher/native_app_whitelist_manager.h"
 #import "ios/web/navigation/crw_session_controller.h"
 #import "ios/web/navigation/crw_session_entry.h"
 #import "ios/web/navigation/navigation_item_impl.h"
 #import "ios/web/navigation/navigation_manager_impl.h"
 #include "ios/web/public/favicon_status.h"
 #include "ios/web/public/favicon_url.h"
 #include "ios/web/public/interstitials/web_interstitial.h"
 #import "ios/web/public/navigation_manager.h"
 #include "ios/web/public/referrer.h"
+#import "ios/web/public/serializable_user_data_manager.h"
 #include "ios/web/public/ssl_status.h"
 #include "ios/web/public/url_scheme_util.h"
 #include "ios/web/public/url_util.h"
 #include "ios/web/public/web_client.h"
 #import "ios/web/public/web_state/js/crw_js_injection_receiver.h"
 #import "ios/web/public/web_state/ui/crw_generic_content_view.h"
 #include "ios/web/public/web_state/web_state.h"
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
 #include "ios/web/public/web_thread.h"
 #import "ios/web/web_state/ui/crw_web_controller.h"
@@ skipping 23 matching lines @@
 NSString* const kTabClosingCurrentDocumentNotificationForCrashReporting =
     @"kTabClosingCurrentDocumentNotificationForCrashReporting";
 
 NSString* const kTabUrlKey = @"url";
 
 namespace {
 class TabHistoryContext;
 class FaviconDriverObserverBridge;
 class TabInfoBarObserver;
 
+// The key under which the Tab ID is stored in the WebState's serializable user
+// data.
+NSString* const kTabIDKey = @"TabID";
+
 // Name of histogram for recording the state of the tab when the renderer is
 // terminated.
 const char kRendererTerminationStateHistogram[] =
     "Tab.StateAtRendererTermination";
 
 // Referrer used for clicks on article suggestions on the NTP.
 const char kChromeContentSuggestionsReferrer[] =
     "https://www.googleapis.com/auth/chrome-content-suggestions";
 
 // Enum corresponding to UMA's TabForegroundState, for
@@ skipping 589 matching lines @@
       nullptr, nullptr, nullptr);
   return base::SysUTF16ToNSString(urlText);
 }
 
 - (NSString*)windowName {
   DCHECK([self navigationManager]);
   return [self navigationManager]->GetSessionController().windowName;
 }
 
 - (NSString*)tabId {
-  DCHECK([self navigationManager]);
-  return [[self navigationManager]->GetSessionController() tabId];
+  DCHECK(self.webState);
+  web::SerializableUserDataManager* userDataManager =
+      web::SerializableUserDataManager::FromWebState(self.webState);
+  id<NSCoding> tabID = userDataManager->GetValueForSerializationKey(kTabIDKey);
+  if (!tabID) {
+    tabID = [[NSUUID UUID] UUIDString];
+    userDataManager->AddSerializableData(tabID, kTabIDKey);
+  }
+  return base::mac::ObjCCastStrict<NSString>(tabID);
 }
 
 - (web::WebState*)webState {
   return webStateImpl_.get();
 }
 
 - (void)fetchFavicon {
   const GURL& url = self.url;
   if (!url.is_valid())
     return;
@@ skipping 1410 matching lines @@
 
 - (TabModel*)parentTabModel {
   return parentTabModel_;
 }
 
 - (FormInputAccessoryViewController*)inputAccessoryViewController {
   return inputAccessoryViewController_.get();
 }
 
 @end