aura: Touch state file after first browser is ready.

chrome/browser/chromeos/legacy_window_manager/initial_browser_window_observer.h

Index: chrome/browser/chromeos/legacy_window_manager/initial_browser_window_observer.h
diff --git a/chrome/browser/chromeos/legacy_window_manager/initial_browser_window_observer.h b/chrome/browser/chromeos/legacy_window_manager/initial_browser_window_observer.h
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_CHROMEOS_LEGACY_WINDOW_MANAGER_INITIAL_BROWSER_WINDOW_OBSERVER_H_
+#define CHROME_BROWSER_CHROMEOS_LEGACY_WINDOW_MANAGER_INITIAL_BROWSER_WINDOW_OBSERVER_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+namespace content {
+class NotificationDetails;
+class NotificationSource;
+}
+
+namespace chromeos {
+
+// The old X window manager for Chrome OS touches a file under /var/run/state
+// when it sees the first Chrome browser window get mapped post-login.  Tests
+// then watch for this file to determine when login is completed.  There's no X
+// window manager running for Aura builds, so we make Chrome replicate this
+// behavior itself.
+//
+// TODO(derat): Once Aura is fully in use in Chrome OS, remove this and make
+// tests instead use pyauto to communicate with Chrome.
+class InitialBrowserWindowObserver : public content::NotificationObserver {
+ public:
+  InitialBrowserWindowObserver();
+  ~InitialBrowserWindowObserver() {}
+
+  // content::NotificationObserver implementation:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+ private:
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(InitialBrowserWindowObserver);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LEGACY_WINDOW_MANAGER_INITIAL_BROWSER_WINDOW_OBSERVER_H_