Disable rendering when suspending on chrome os

chrome/browser/chromeos/login/lock/webui_screen_locker.cc

Index: chrome/browser/chromeos/login/lock/webui_screen_locker.cc
diff --git a/chrome/browser/chromeos/login/lock/webui_screen_locker.cc b/chrome/browser/chromeos/login/lock/webui_screen_locker.cc
index 0b558f7b0fe220666ebb9f87aabb568de6e4cbcb..08cdae9e7979eb22314d03329318ef51f3e499f7 100644
--- a/chrome/browser/chromeos/login/lock/webui_screen_locker.cc
+++ b/chrome/browser/chromeos/login/lock/webui_screen_locker.cc
@@ -4,6 +4,8 @@
 
 #include "chrome/browser/chromeos/login/lock/webui_screen_locker.h"
 
+#include "ash/shell.h"
+#include "ash/system/chromeos/power/power_event_observer.h"
 #include "ash/wm/lock_state_controller.h"
 #include "ash/wm/lock_state_observer.h"
 #include "base/command_line.h"
@@ -203,6 +205,12 @@ void WebUIScreenLocker::OnLockBackgroundDisplayed() {
                       base::TimeTicks::Now() - lock_time_);
 }
 
+void WebUIScreenLocker::OnHeaderBarVisible() {
+  DCHECK(ash::Shell::HasInstance());
+
+  ash::Shell::GetInstance()->power_event_observer()->OnLockAnimationsComplete();
+}
+
 OobeUI* WebUIScreenLocker::GetOobeUI() {
   return static_cast<OobeUI*>(GetWebUI()->GetController());
 }