Change Chrome OS SchedulerConfiguration default to conservative.

BUG=chromium:927840
TEST=Manual

Change-Id: I2911433cf2b69b4ef5c658194d8c1f13d0a53c0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611610Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Mattias Nissler <mnissler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659511}

chrome/browser/chromeos/scheduler_configuration_manager.cc

@@ -77,7 +77,7 @@ void SchedulerConfigurationManager::OnPrefChange() {
   } else if (!feature_param_value.empty()) {
     config_name = feature_param_value;
   } else {
-    config_name = debugd::scheduler_configuration::kPerformanceScheduler;
+    config_name = debugd::scheduler_configuration::kConservativeScheduler;
   }
 
   // NB: Also send an update when the config gets reset to let the system pick

chrome/browser/chromeos/scheduler_configuration_manager_unittest.cc

@@ -54,7 +54,7 @@ TEST_F(SchedulerConfigurationManagerTest, ConfigChange) {
   // Correct default is used when there is no configured value.
   SchedulerConfigurationManager manager(&debug_daemon_client_, &local_state_);
   scoped_task_environment_.RunUntilIdle();
-  EXPECT_EQ(debugd::scheduler_configuration::kPerformanceScheduler,
+  EXPECT_EQ(debugd::scheduler_configuration::kConservativeScheduler,
             debug_daemon_client_.scheduler_configuration_name());
 
   // Change user pref, which should trigger a config change.
@@ -77,7 +77,7 @@ TEST_F(SchedulerConfigurationManagerTest, ConfigChange) {
   // Dropping the policy as well reverts to the default configuration.
   local_state_.RemoveManagedPref(prefs::kSchedulerConfiguration);
   scoped_task_environment_.RunUntilIdle();
-  EXPECT_EQ(debugd::scheduler_configuration::kPerformanceScheduler,
+  EXPECT_EQ(debugd::scheduler_configuration::kConservativeScheduler,
             debug_daemon_client_.scheduler_configuration_name());
 }