Move pref backing up flags from local state to device settings on ChromeOS.

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 25 matching lines @@
 
 #if defined(ENABLE_MESSAGE_CENTER)
 #include "ui/message_center/message_center_switches.h"
 #endif
 
 #if defined(USE_ASH)
 #include "ash/ash_switches.h"
 #endif
 
 #if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/settings/cros_settings.h"
+#include "chrome/browser/chromeos/settings/cros_settings_names.h"
 #include "chromeos/chromeos_switches.h"
 #endif
 
 using content::UserMetricsAction;
 
 namespace about_flags {
 
 // Macros to simplify specifying the type.
 #define SINGLE_VALUE_TYPE_AND_VALUE(command_line_switch, switch_value) \
     Experiment::SINGLE_VALUE, \
@@ skipping 1254 matching lines @@
     return Singleton<FlagsState>::get();
   }
 
  private:
   bool needs_restart_;
   std::map<std::string, std::string> flags_switches_;
 
   DISALLOW_COPY_AND_ASSIGN(FlagsState);
 };
 
+#if defined(OS_CHROMEOS)
+// Extracts the list of enabled lab experiments from device settings and stores
+// them in a set.
+void GetEnabledFlagsFromDeviceSettings(std::set<std::string>* result) {
+  const ListValue* enabled_experiments;
+  if (!chromeos::CrosSettings::Get()->GetList(chromeos::kStartUpFlags,
+                                              &enabled_experiments)) {
+    return;
+  }
+
+  for (ListValue::const_iterator it = enabled_experiments->begin();
+       it != enabled_experiments->end();
+       ++it) {
+    std::string experiment_name;
+    if (!(*it)->GetAsString(&experiment_name)) {
+      LOG(WARNING) << "Invalid entry in " << chromeos::kStartUpFlags;
+      continue;
+    }
+    result->insert(experiment_name);
+  }
+}
+
+// Takes a set of enabled lab experiments and saves it into the device settings
+// storage on ChromeOS.
+void SetEnabledFlagsToDeviceSettings(
+    const std::set<std::string>& enabled_experiments) {
+  scoped_ptr<base::ListValue> experiments_list(new base::ListValue());
+
+  for (std::set<std::string>::const_iterator it = enabled_experiments.begin();
+       it != enabled_experiments.end();
+       ++it) {
+    experiments_list->Append(new StringValue(*it));
+  }
+  chromeos::CrosSettings::Get()->Set(chromeos::kStartUpFlags,
+                                     *experiments_list);
+}
+#endif
+
 // Extracts the list of enabled lab experiments from preferences and stores them
-// in a set.
+// in a set. On ChromeOS |prefs| can be NULL when reading machine level flags.
 void GetEnabledFlags(const PrefService* prefs, std::set<std::string>* result) {
+#if defined(OS_CHROMEOS)
+  // On ChromeOS flags are stored in the device settings blob.
+  if (!prefs) {
+    GetEnabledFlagsFromDeviceSettings(result);
+    return;
+  }
+#else
+  // Never allow |prefs| to be NULL on other platforms.
+  CHECK(prefs);
+#endif
+
   const ListValue* enabled_experiments = prefs->GetList(
       prefs::kEnabledLabsExperiments);
   if (!enabled_experiments)
     return;
 
   for (ListValue::const_iterator it = enabled_experiments->begin();
        it != enabled_experiments->end();
        ++it) {
     std::string experiment_name;
     if (!(*it)->GetAsString(&experiment_name)) {
       LOG(WARNING) << "Invalid entry in " << prefs::kEnabledLabsExperiments;
       continue;
     }
     result->insert(experiment_name);
   }
 }
 
-// Takes a set of enabled lab experiments
+// Takes a set of enabled lab experiments. On ChromeOS |prefs| can be NULL when
+// setting machine level flags.
 void SetEnabledFlags(
     PrefService* prefs, const std::set<std::string>& enabled_experiments) {
+#if defined(OS_CHROMEOS)
+  // On ChromeOS flags are stored in the device settings blob.
+  if (!prefs) {
+    SetEnabledFlagsToDeviceSettings(enabled_experiments);
+    return;
+  }
+#else
+  // Never allow |prefs| to be NULL on other platforms.
+  CHECK(prefs);
+#endif
+
   ListPrefUpdate update(prefs, prefs::kEnabledLabsExperiments);
   ListValue* experiments_list = update.Get();
 
   experiments_list->Clear();
   for (std::set<std::string>::const_iterator it = enabled_experiments.begin();
        it != enabled_experiments.end();
        ++it) {
     experiments_list->Append(new StringValue(*it));
   }
 }
@@ skipping 419 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags