[chromedriver] Add JavaScript fallback for GoBack/GoForward if DevTools commands aren't available

chrome/test/chromedriver/chrome/web_view_impl.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 CHROME_TEST_CHROMEDRIVER_CHROME_WEB_VIEW_IMPL_H_
 #define CHROME_TEST_CHROMEDRIVER_CHROME_WEB_VIEW_IMPL_H_
 
 #include <list>
 #include <string>
 
@@ skipping 78 matching lines @@
   Status OverrideGeolocation(const Geoposition& geoposition) override;
   Status CaptureScreenshot(std::string* screenshot) override;
   Status SetFileInputFiles(const std::string& frame,
                            const base::DictionaryValue& element,
                            const std::vector<base::FilePath>& files) override;
   Status TakeHeapSnapshot(scoped_ptr<base::Value>* snapshot) override;
   Status StartProfile() override;
   Status EndProfile(scoped_ptr<base::Value>* profile_data) override;
 
  private:
+  Status TraverseHistoryWithJavaScript(int delta);
   Status CallAsyncFunctionInternal(const std::string& frame,
                                    const std::string& function,
                                    const base::ListValue& args,
                                    bool is_user_supplied,
                                    const base::TimeDelta& timeout,
                                    scoped_ptr<base::Value>* result);
   Status IsNotPendingNavigation(const std::string& frame_id,
                                 bool* is_not_pending);
 
   Status InitProfileInternal();
@@ skipping 37 matching lines @@
 Status GetNodeIdFromFunction(DevToolsClient* client,
                              int context_id,
                              const std::string& function,
                              const base::ListValue& args,
                              bool* found_node,
                              int* node_id);
 
 }  // namespace internal
 
 #endif  // CHROME_TEST_CHROMEDRIVER_CHROME_WEB_VIEW_IMPL_H_