[Sync] Updated CookieJarMismatch to handle multiple sync cycles during OpenTabAndGetLocalWindows.

chrome/browser/sync/test/integration/sessions_helper.h

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_SYNC_TEST_INTEGRATION_SESSIONS_HELPER_H_
 #define CHROME_BROWSER_SYNC_TEST_INTEGRATION_SESSIONS_HELPER_H_
 
 #include <algorithm>
 #include <map>
 #include <memory>
@@ skipping 15 matching lines @@
 using SessionWindowMap = std::map<SessionID::id_type, sessions::SessionWindow*>;
 using ScopedWindowMap =
     std::map<SessionID::id_type, std::unique_ptr<sessions::SessionWindow>>;
 
 // Copies the local session windows of profile |index| to |local_windows|.
 // Returns true if successful.
 bool GetLocalWindows(int index, ScopedWindowMap* local_windows);
 
 // Creates and verifies the creation of a new window for profile |index| with
 // one tab displaying |url|. Copies the SessionWindow associated with the new
-// window to |local_windows|. Returns true if successful.
+// window to |local_windows|. Returns true if successful. This call results in
+// multiple sessions changes, and performs synchronous blocking. It is rare, but
+// possible, that multiple sync cycle commits occur as a result of this call.
+// Test cases should be written to handle this possibility, otherwise they may
+// flake.
 bool OpenTabAndGetLocalWindows(int index,
                                const GURL& url,
                                ScopedWindowMap* local_windows);
 
 // Checks that window count and foreign session count are 0.
 bool CheckInitialState(int index);
 
 // Returns number of open windows for a profile.
 int GetNumWindows(int index);
 
@@ skipping 76 matching lines @@
   // StatusChangeChecker implementation.
   bool IsExitConditionSatisfied() override;
   std::string GetDebugMessage() const override;
 
  private:
   int index_;
   const std::vector<sessions_helper::ScopedWindowMap>& windows_;
 };
 
 #endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_SESSIONS_HELPER_H_