cros: Various fixes needed for preloading lock screen.

chrome/browser/chromeos/login/ui/shared_web_view.h

Index: chrome/browser/chromeos/login/ui/shared_web_view.h
diff --git a/chrome/browser/chromeos/login/ui/shared_web_view.h b/chrome/browser/chromeos/login/ui/shared_web_view.h
index abe936f872deac7e161517c56717eab5b16a174c..39300becf0324ef8ed873b4cfe6e78866478086b 100644
--- a/chrome/browser/chromeos/login/ui/shared_web_view.h
+++ b/chrome/browser/chromeos/login/ui/shared_web_view.h
@@ -37,6 +37,9 @@ class SharedWebView : public KeyedService,
   // was freshly created.
   bool Get(const GURL& url, scoped_refptr<WebViewHandle>* out_handle);
 
+  // Returns true if there is an attached views::WebView instance.
+  bool has_web_view() const { return !!web_view_handle_; }
+
  private:
   // content::NotificationObserver:
   void Observe(int type,