Add unittests for X11TopmostWindowFinder

ui/views/test/x11_property_change_waiter.h

+// Copyright 2014 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 UI_VIEWS_TEST_X11_PROPERTY_CHANGE_WAITER_H_
+#define UI_VIEWS_TEST_X11_PROPERTY_CHANGE_WAITER_H_
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/events/platform/platform_event_dispatcher.h"
+#include "ui/events/platform/platform_event_types.h"
+#include "ui/gfx/x/x11_types.h"
+
+namespace ui {
+class ScopedEventDispatcher;
+class X11AtomCache;
+}
+
+namespace views {
+
+// Blocks till the value of |property| on |window| changes.
+class X11PropertyChangeWaiter : public ui::PlatformEventDispatcher {
+ public:
+  X11PropertyChangeWaiter(XID window, const char* property);
+  virtual ~X11PropertyChangeWaiter();
+
+  // Blocks till the value of |property_| changes.
+  void Wait();
+
+ protected:
+  // Returns whether the run loop can exit.

[sadrul, 2014/05/27 15:17:18]

Mention here that |event| can be NULL, and explain what that means.

+  virtual bool ShouldKeepOnWaiting(const ui::PlatformEvent& event);
+
+  XID xwindow() const {
+    return x_window_;
+  }
+
+ private:
+  // ui::PlatformEventDispatcher:
+  virtual bool CanDispatchEvent(const ui::PlatformEvent& event) OVERRIDE;
+  virtual uint32_t DispatchEvent(const ui::PlatformEvent& event) OVERRIDE;
+
+  XID x_window_;
+  const char* property_;
+
+  // Whether Wait() should block.
+  bool wait_;
+
+  // Ends the run loop.
+  base::Closure quit_closure_;
+
+  // The event mask to be restored upon PropertyChangeWaiter's destruction.
+  long old_event_mask_;
+
+  scoped_ptr<ui::ScopedEventDispatcher> dispatcher_;
+
+  scoped_ptr<ui::X11AtomCache> atom_cache_;
+
+  DISALLOW_COPY_AND_ASSIGN(X11PropertyChangeWaiter);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_TEST_X11_PROPERTY_CHANGE_WAITER_H_