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diff --git a/chrome/browser/page_cycler/page_cycler.h b/chrome/browser/page_cycler/page_cycler.h
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+// 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_PAGE_CYCLER_PAGE_CYCLER_H_
+#define CHROME_BROWSER_PAGE_CYCLER_PAGE_CYCLER_H_
+#pragma once
+
+#include "base/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace content {
+class RenderViewHost;
+}  // namespace content
+
+namespace base {
+class TimeTicks;
+}  // namespace base
+
+// Performance test to track the resources used and speed with which chromium
+// fully loads a given set of URLs.  This class is created on the UI thread and
+// does most of its work there. However, some work happens on background threads
+// too; those are named with 'OnBackgroundThread'.
+class PageCycler : public base::RefCountedThreadSafe<PageCycler>,
+                   public BrowserList::Observer,
+                   public content::WebContentsObserver {
+ public:
+  PageCycler(Browser* browser, FilePath urls_file);
+
+  // Begin running the page cycler.
+  void Run(const int& total_iterations);
+
+  // content::WebContentsObserver
+  virtual void DidFinishLoad(int64 frame_id,
+                             const GURL& validated_url,
+                             bool is_main_frame) OVERRIDE;
+  virtual void DidFailProvisionalLoad(
+      int64 frame_id,
+      bool is_main_frame,
+      const GURL& validated_url,
+      int error_code,
+      const string16& error_description,
+      content::RenderViewHost* render_view_host) OVERRIDE;
+
+  // This method should never be necessary while running PageCycler; this is
+  // for testing purposes only.
+  const std::vector<GURL>* urls_for_test() { return &urls_; }
+
+  void set_stats_file(const FilePath& stats_file) { stats_file_ = stats_file; }
+  void set_errors_file(const FilePath& errors_file) {
+    errors_file_ = errors_file;
+  }
+
+
+ protected:
+  virtual ~PageCycler();
+
+ private:
+  friend class base::RefCountedThreadSafe<PageCycler>;
+  friend class MockPageCycler;
+
+  // Check to see if a load callback is valid; i.e. the load should be from the
+  // main frame, the url should not be a chrome error url, and |url_index|
+  // should not be 0.
+  bool IsLoadCallbackValid(const GURL& validated_url,
+                           bool is_main_frame);
+
+  // Read in the urls from |urls_file_| and store them in |urls_|.
+  void ReadURLsOnBackgroundThread();
+
+  // Perform any initial setup neccessary, and begin visiting the pages.
+  void BeginCycle();
+
+  // If |url_index_| points to a valid position in |urls_|, load the url,
+  // capturing any statistics information. Otherwise, call WriteResults.
+  void LoadNextURL();
+
+  // Complete statistics gathering for the finished visit, and try to load the
+  // next url.
+  void LoadSucceeded();
+
+  // Inidicate that the load failed with an error; try to load the next url.
+  void LoadFailed(const GURL& url, const string16& error_description);
+
+  // Finalize the output strings.
+  void PrepareResultsOnBackgroundThread();
+
+  // Write the data stored within output to the file indicated by |stats_file_|,
+  // if |stats_file_| is not empty. Write any errors to |errors_file_|.
+  void WriteResultsOnBackgroundThread(std::string output);
+
+  // Perform any necessary cleanup and exit |browser_|.
+  void Finish();
+
+  // Called when the Browser to which |browser_| points is closed; exits
+  // PageCycler.
+  void Abort();
+
+  // BrowserList::Observer
+  virtual void OnBrowserAdded(Browser* browser) OVERRIDE;
+  virtual void OnBrowserRemoved(Browser* browser) OVERRIDE;
+
+  // The Browser context in which the page cycler is running.
+  Browser* browser_;
+
+  // The path to the file containing the list of urls to visit.
+  FilePath urls_file_;
+
+  // The path to the file to which we write any errors encountered.
+  FilePath errors_file_;
+
+  // The path to the file to which we write the statistics (optional, may be
+  // an empty path).
+  FilePath stats_file_;
+
+  // The list of urls to visit.
+  std::vector<GURL> urls_;
+
+  // The current index into the |urls_| vector.
+  size_t url_index_;
+
+  // The number of total iterations to be run.
+  int total_iterations_;
+
+  // The number of the current iteration.
+  int current_iteration_;
+
+  // The generated string of urls which we have visited; this is built one url
+  // at a time as we iterate through the |urls_| vector. This is primarily
+  // included for interfacing with the previous page_cycler's output style.
+  std::string urls_string_;
+
+  // The generated string of the times taken to visit each url. As with
+  // |urls_string_|, this is built as we visit each url, and is primarily to
+  // produce output similar to the previous page_cycler's.
+  std::string timings_string_;
+
+  // The time at which we begin the process of loading the next url; this is
+  // used to calculate the time taken for each url load.
+  base::TimeTicks initial_time_;
+
+  // Indicates the abort status of the page cycler; true means aborted.
+  bool aborted_;
+
+  string16 error_;
+
+  DISALLOW_COPY_AND_ASSIGN(PageCycler);
+};
+
+#endif  // CHROME_BROWSER_PAGE_CYCLER_PAGE_CYCLER_H_