Move //components/test_runner back into //content/shell

components/test_runner/tracked_dictionary.h

-// Copyright 2016 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 COMPONENTS_TEST_RUNNER_TRACKED_DICTIONARY_H_
-#define COMPONENTS_TEST_RUNNER_TRACKED_DICTIONARY_H_
-
-#include <memory>
-#include <string>
-
-#include "base/macros.h"
-#include "base/values.h"
-#include "components/test_runner/test_runner_export.h"
-
-namespace test_runner {
-
-// TrackedDictionary wraps base::DictionaryValue, but forces all mutations to go
-// through TrackedDictionary's Set methods.  This allows tracking of changes
-// accumulated since the last call to ResetChangeTracking.
-class TEST_RUNNER_EXPORT TrackedDictionary {
- public:
-  TrackedDictionary();
-
-  // Current value of the tracked dictionary.
-  const base::DictionaryValue& current_values() const {
-    return current_values_;
-  }
-
-  // Subset of |current_values| that have been changed (i.e. via Set method)
-  // since the last call to ResetChangeTracking.
-  const base::DictionaryValue& changed_values() const {
-    return changed_values_;
-  }
-
-  // Clears out |changed_values|.
-  void ResetChangeTracking();
-
-  // Overwrites |current_values| with values present in |new_changes|.
-  // The new values are not present in |changed_values| afterwards.
-  void ApplyUntrackedChanges(const base::DictionaryValue& new_changes);
-
-  // Sets a value in |current_values| and tracks the change in |changed_values|.
-  void Set(const std::string& path, std::unique_ptr<base::Value> new_value);
-
-  // Type-specific setter for convenience.
-  void SetBoolean(const std::string& path, bool new_value);
-  void SetString(const std::string& path, const std::string& new_value);
-
- private:
-  base::DictionaryValue current_values_;
-  base::DictionaryValue changed_values_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrackedDictionary);
-};
-
-}  // namespace test_runner
-
-#endif  // COMPONENTS_TEST_RUNNER_TRACKED_DICTIONARY_H_