Fix for the NavigationControllerTest.BackSubframe test failures with PlzNavigate

content/test/test_render_frame_host.h

 // Copyright 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_TEST_TEST_RENDER_FRAME_HOST_H_
 #define CONTENT_TEST_TEST_RENDER_FRAME_HOST_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/macros.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/test/mock_render_process_host.h"
 #include "content/public/test/test_renderer_host.h"
 #include "content/test/test_render_view_host.h"
 #include "ui/base/page_transition_types.h"
 
 struct FrameHostMsg_DidCommitProvisionalLoad_Params;
 
 namespace content {
 
+class PageState;
+
 class TestRenderFrameHostCreationObserver : public WebContentsObserver {
  public:
   explicit TestRenderFrameHostCreationObserver(WebContents* web_contents);
   ~TestRenderFrameHostCreationObserver() override;
 
   // WebContentsObserver implementation.
   void RenderFrameCreated(RenderFrameHost* render_frame_host) override;
 
   RenderFrameHost* last_created_frame() const { return last_created_frame_; }
 
@@ skipping 105 matching lines @@
   // interaction with the IO thread up until the response is ready to commit.
   void PrepareForCommitIfNecessary();
 
   // PlzNavigate
   void set_pending_commit(bool pending) { pending_commit_ = pending; }
   bool pending_commit() const { return pending_commit_; }
 
   // Creates a WebBluetooth Service with a dummy InterfaceRequest.
   WebBluetoothServiceImpl* CreateWebBluetoothServiceForTesting();
 
+  // Creates an encoded page state for the |url|, |item_sequence_number| and
+  // |document_sequence_number| parameters.
+  static PageState CreatePageStateForURL(const GURL& url,
+                                         int64_t item_sequence_number,
+                                         int64_t document_sequence_number);
  private:
   void SendNavigateWithParameters(int page_id,
                                   int nav_entry_id,
                                   bool did_create_new_entry,
                                   bool should_replace_entry,
                                   const GURL& url,
                                   ui::PageTransition transition,
                                   int response_code,
                                   const ModificationCallback& callback);
 
   // Computes the page ID for a pending navigation in this RenderFrameHost;
   int32_t ComputeNextPageID();
 
   void SimulateWillStartRequest(ui::PageTransition transition);
 
   TestRenderFrameHostCreationObserver child_creation_observer_;
 
   std::string contents_mime_type_;
 
   // See set_simulate_history_list_was_cleared() above.
   bool simulate_history_list_was_cleared_;
 
   DISALLOW_COPY_AND_ASSIGN(TestRenderFrameHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_RENDER_FRAME_HOST_H_