Fix for the NavigationControllerTest.BackSubframe test failures with PlzNavigate

content/public/common/page_state.h

 // Copyright (c) 2013 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 CONTENT_PUBLIC_COMMON_PAGE_STATE_H_
 #define CONTENT_PUBLIC_COMMON_PAGE_STATE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 17 matching lines @@
  public:
   static PageState CreateFromEncodedData(const std::string& data);
   static PageState CreateFromURL(const GURL& url);
 
   static PageState CreateForTesting(
       const GURL& url,
       bool body_contains_password_data,
       const char* optional_body_data,
       const base::FilePath* optional_body_file_path);
 
+  // Creates an encoded page state from the |url|, |item_sequence_mnumber| and
+  // |document_sequence_number| parameters.
+  static PageState CreateForTestingWithSequenceNumbers(
+      const GURL& url,
+      int64_t item_sequence_number,
+      int64_t document_sequence_number);
+
   PageState();
 
   bool IsValid() const;
   bool Equals(const PageState& page_state) const;
   const std::string& ToEncodedData() const;
 
   std::vector<base::FilePath> GetReferencedFiles() const;
   PageState RemovePasswordData() const;
   PageState RemoveScrollOffset() const;
   PageState RemoveReferrer() const;
 
  private:
   PageState(const std::string& data);
 
   std::string data_;
 };
 
 // Support DCHECK_EQ(a, b), etc.
 inline bool operator==(const PageState& a, const PageState& b) {
   return a.Equals(b);
 }
 inline bool operator!=(const PageState& a, const PageState& b) {
   return !(a == b);
 }
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_PAGE_STATE_H_