Add reset all button to flags page

chrome/browser/about_flags.cc

 // 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.
 
 #include "chrome/browser/about_flags.h"
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 1275 matching lines @@
 // Stores and encapsulates the little state that about:flags has.
 class FlagsState {
  public:
   FlagsState() : needs_restart_(false) {}
   void ConvertFlagsToSwitches(PrefService* prefs, CommandLine* command_line);
   bool IsRestartNeededToCommitChanges();
   void SetExperimentEnabled(
       PrefService* prefs, const std::string& internal_name, bool enable);
   void RemoveFlagsSwitches(
       std::map<std::string, CommandLine::StringType>* switch_list);
+  void ResetAllFlags(PrefService* prefs);
   void reset();
 
   // Returns the singleton instance of this class
   static FlagsState* GetInstance() {
     return Singleton<FlagsState>::get();
   }
 
  private:
   bool needs_restart_;
   std::map<std::string, std::string> flags_switches_;
@@ skipping 201 matching lines @@
 void SetExperimentEnabled(
     PrefService* prefs, const std::string& internal_name, bool enable) {
   FlagsState::GetInstance()->SetExperimentEnabled(prefs, internal_name, enable);
 }
 
 void RemoveFlagsSwitches(
     std::map<std::string, CommandLine::StringType>* switch_list) {
   FlagsState::GetInstance()->RemoveFlagsSwitches(switch_list);
 }
 
+void ResetAllFlags(PrefService* prefs) {
+  FlagsState::GetInstance()->ResetAllFlags(prefs);
+}
+
 int GetCurrentPlatform() {
 #if defined(OS_MACOSX)
   return kOsMac;
 #elif defined(OS_WIN)
   return kOsWin;
 #elif defined(OS_CHROMEOS)  // Needs to be before the OS_LINUX check.
   return kOsCrOS;
 #elif defined(OS_LINUX) || defined(OS_OPENBSD)
   return kOsLinux;
 #elif defined(OS_ANDROID)
@@ skipping 145 matching lines @@
 }
 
 void FlagsState::RemoveFlagsSwitches(
     std::map<std::string, CommandLine::StringType>* switch_list) {
   for (std::map<std::string, std::string>::const_iterator
            it = flags_switches_.begin(); it != flags_switches_.end(); ++it) {
     switch_list->erase(it->first);
   }
 }
 
+void FlagsState::ResetAllFlags(PrefService* prefs) {
+  needs_restart_ = true;
+
+  std::set<std::string> no_experiments;
+  SetEnabledFlags(prefs, no_experiments);
+}
+
 void FlagsState::reset() {
   needs_restart_ = false;
   flags_switches_.clear();
 }
 
 }  // namespace
 
 namespace testing {
 
 // WARNING: '@' is also used in the html file. If you update this constant you
@@ skipping 15 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags