[sync] Scope BrowserListRouterHelper to browsers with a matching profile

chrome/browser/sync/sessions/browser_list_router_helper.h

 // 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 CHROME_BROWSER_SYNC_SESSIONS_BROWSER_LIST_ROUTER_HELPER_H_
 #define CHROME_BROWSER_SYNC_SESSIONS_BROWSER_LIST_ROUTER_HELPER_H_
 
 #include "chrome/browser/sync/sessions/sync_sessions_web_contents_router.h"
 #include "chrome/browser/ui/browser_list_observer.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
 
 namespace sync_sessions {
 
 // Non-android helper of SyncSessionsWebContentsRouter that adds tracking for
 // multi-window scenarios(e.g. tab movement between windows). Android doesn't
 // have a BrowserList or TabStrip, so it doesn't compile the needed
 // dependencies, nor would it benefit from the added tracking.
 class BrowserListRouterHelper : public chrome::BrowserListObserver,
                                 public TabStripModelObserver {
  public:
-  explicit BrowserListRouterHelper(SyncSessionsWebContentsRouter* router);
+  explicit BrowserListRouterHelper(SyncSessionsWebContentsRouter* router,
+                                   Profile* profile);
   ~BrowserListRouterHelper() override;
 
  private:
+  friend class BrowserListRouterHelperTest;
+
   // chrome::BrowserListObserver implementation.
   void OnBrowserAdded(Browser* browser) override;
   void OnBrowserRemoved(Browser* browser) override;
   // TabStripModelObserver implementation.
   void TabInsertedAt(TabStripModel* model,
                      content::WebContents* web_contents,
                      int index,
                      bool foreground) override;
 
   // |router_| owns |this|.
   SyncSessionsWebContentsRouter* router_;
 
+  Profile* profile_;
+
+  std::set<Browser*> attached_browsers_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserListRouterHelper);
 };
 
 }  // namespace sync_sessions
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_BROWSER_LIST_ROUTER_HELPER_H_