Improve panel tests by properly waiting for expected conditions.

chrome/browser/ui/panels/test_panel_notification_observer.h

 // Copyright (c) 2012 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_UI_PANELS_TEST_PANEL_ACTIVE_STATE_OBSERVER_H_
-#define CHROME_BROWSER_UI_PANELS_TEST_PANEL_ACTIVE_STATE_OBSERVER_H_
+#ifndef CHROME_BROWSER_UI_PANELS_TEST_PANEL_NOTIFICATION_OBSERVER_H_
+#define CHROME_BROWSER_UI_PANELS_TEST_PANEL_NOTIFICATION_OBSERVER_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
-class Panel;
-
 namespace content {
 class MessageLoopRunner;
+class NotificaitonSource;
 }
 
-// Custom notification observer for waiting on panel active state.
-// Modeled after ui_test_utils notification observers.
-class PanelActiveStateObserver : public content::NotificationObserver {
+// Common base class for a custom notification observer that waits
+// on a notification until an expected state is achieved.
+// Modeled after ui_test_utils notification observers, but can handle
+// more than one occurrence of the notification.
+class TestPanelNotificationObserver : public content::NotificationObserver {
  public:
-  // Register to listen for panel active state change notifications
-  // for the specified panel to detect a change to the expected active
-  // state.
-  PanelActiveStateObserver(Panel* panel, bool expect_active);
-  virtual ~PanelActiveStateObserver();
+  TestPanelNotificationObserver(int notification,
+                                const content::NotificationSource& source);
+  virtual ~TestPanelNotificationObserver();
 
-  // Wait until the active state has changed to the expected state.
+  // Wait until the expected state is achieved.
   void Wait();
 
   // content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
- private:
-  bool AtExpectedState();
-  Panel* panel_;
-  bool expect_active_;
+ protected:
+  virtual bool AtExpectedState() = 0;
+
   bool seen_;  // true after transition to expected state has been seen
   bool running_;  // indicates whether message loop is running
   content::NotificationRegistrar registrar_;
   scoped_refptr<content::MessageLoopRunner> message_loop_runner_;
 
-  DISALLOW_COPY_AND_ASSIGN(PanelActiveStateObserver);
+  DISALLOW_COPY_AND_ASSIGN(TestPanelNotificationObserver);
 };
 
-#endif  // CHROME_BROWSER_UI_PANELS_TEST_PANEL_ACTIVE_STATE_OBSERVER_H_
+#endif  // CHROME_BROWSER_UI_PANELS_TEST_PANEL_NOTIFICATION_OBSERVER_H_