[cros] Change how we track momemt to emit login-prompt-visible signal.

chrome/browser/chromeos/login/webui_login_view.h

Index: chrome/browser/chromeos/login/webui_login_view.h
diff --git a/chrome/browser/chromeos/login/webui_login_view.h b/chrome/browser/chromeos/login/webui_login_view.h
index a1585df503f30d22fe93d8fb79bb79674c788a35..327c6eee49286da016280a46de06818a27f711cc 100644
--- a/chrome/browser/chromeos/login/webui_login_view.h
+++ b/chrome/browser/chromeos/login/webui_login_view.h
@@ -111,6 +111,12 @@ class WebUILoginView : public views::WidgetDelegateView,
       const content::WebContents* source) const OVERRIDE;
   virtual bool TakeFocus(bool reverse) OVERRIDE;
 
+  // Performs series of actions when login prompt is considered
+  // to be ready and visible.
+  // 1. Emits LoginPromptVisible signal if needed
+  // 2. Notifies OOBE/sign classes.
+  void OnLoginPromptVisible();
+
   // Called when focus is returned from status area.
   // |reverse| is true when focus is traversed backwards (using Shift-Tab).
   void ReturnFocus(bool reverse);
@@ -137,11 +143,6 @@ class WebUILoginView : public views::WidgetDelegateView,
   // Whether the host window is frozen.
   bool host_window_frozen_;
 
-  // Has the login page told us that it's ready?  This is triggered by either
-  // all of the user images or the GAIA prompt being loaded, whichever comes
-  // first.
-  bool login_page_is_loaded_;
-
   // Should we emit the login-prompt-visible signal when the login page is
   // displayed?
   bool should_emit_login_prompt_visible_;