chromeos: power: Refactor RendererFreezer and add tests

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index 77b673060e27db7b27cd330d9a925d61f00252f8..f901fad10dfa25cfc11947f22fae8e13f9ac20f5 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -64,6 +64,7 @@
 #include "chrome/browser/chromeos/power/power_data_collector.h"
 #include "chrome/browser/chromeos/power/power_prefs.h"
 #include "chrome/browser/chromeos/power/renderer_freezer.h"
+#include "chrome/browser/chromeos/power/renderer_freezer_delegate.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/settings/device_oauth2_token_service_factory.h"
 #include "chrome/browser/chromeos/settings/device_settings_service.h"
@@ -561,7 +562,8 @@ void ChromeBrowserMainPartsChromeos::PostProfileInit() {
 
   peripheral_battery_observer_.reset(new PeripheralBatteryObserver());
 
-  renderer_freezer_.reset(new RendererFreezer());
+  renderer_freezer_.reset(new RendererFreezer(
+      scoped_ptr<RendererFreezer::Delegate>(new RendererFreezerDelegate())));
 
   g_browser_process->platform_part()->InitializeAutomaticRebootManager();