Move password reset on login screen from after wake up to before suspend

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 6d8261046aac672b50082e34de99eb9952510e99..0b558f7b0fe220666ebb9f87aabb568de6e4cbcb 100644
--- a/chrome/browser/chromeos/login/lock/webui_screen_locker.cc
+++ b/chrome/browser/chromeos/login/lock/webui_screen_locker.cc
@@ -154,6 +154,13 @@ void WebUIScreenLocker::FocusUserPod() {
   GetWebUI()->CallJavascriptFunction("cr.ui.Oobe.forceLockedUserPodFocus");
 }
 
+void WebUIScreenLocker::ResetAndFocusUserPod() {
+  if (!webui_ready_)
+    return;
+  GetWebUI()->CallJavascriptFunction("cr.ui.Oobe.clearUserPodPassword");
+  FocusUserPod();
+}
+
 WebUIScreenLocker::~WebUIScreenLocker() {
   DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(this);
   ash::Shell::GetScreen()->RemoveObserver(this);
@@ -308,10 +315,19 @@ void WebUIScreenLocker::OnWidgetDestroying(views::Widget* widget) {
 
 void WebUIScreenLocker::LidEventReceived(bool open,
                                          const base::TimeTicks& time) {
+  if (open) {
+    content::BrowserThread::PostTask(
+        content::BrowserThread::UI, FROM_HERE,
+        base::Bind(&WebUIScreenLocker::FocusUserPod,
+                   weak_factory_.GetWeakPtr()));
+  }
+}
+
+void WebUIScreenLocker::SuspendImminent() {
   content::BrowserThread::PostTask(

[Chirantan Ekbote, 2015/02/11 22:53:12]

This can race with the system suspend if the message loop is particularly busy. 
So the callback might run after a resume instead.  If you want to be sure that
the callback runs before the system suspends, you need to call
GetSuspendReadinessCallback() from the PowerManagerClient and then run that
callback from ResetAndFocusUserPod().

-      content::BrowserThread::UI,
-      FROM_HERE,
-      base::Bind(&WebUIScreenLocker::FocusUserPod, weak_factory_.GetWeakPtr()));
+      content::BrowserThread::UI, FROM_HERE,
+      base::Bind(&WebUIScreenLocker::ResetAndFocusUserPod,
+                 weak_factory_.GetWeakPtr()));
 }
 
 void WebUIScreenLocker::SuspendDone(const base::TimeDelta& sleep_duration) {