chromeos: Sync animation.

ash/launcher/app_placeholder_view.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 ASH_LAUNCHER_APP_PLACEHOLDER_VIEW_H_
+#define ASH_LAUNCHER_APP_PLACEHOLDER_VIEW_H_
+
+#include "base/timer.h"
+#include "ui/views/view.h"
+
+namespace ash {
+namespace internal {
+
+// AppPlaceholderView displays a pulsing white square. Each instance of this
+// view starts the pulse animation with an incremental delay so that the
+// animations run at different phases.
+class AppPlaceholderView : public views::View {
+ public:
+  AppPlaceholderView();
+  virtual ~AppPlaceholderView();
+
+ private:
+  void ScheduleAnimation();
+
+  // views::View overrides:
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void ViewHierarchyChanged(bool is_add,
+                                    View* parent,
+                                    View* child) OVERRIDE;
+
+  base::OneShotTimer<AppPlaceholderView> animation_delay_timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppPlaceholderView);
+};
+
+}  // namespace internal
+}  // namesapce ash
+
+#endif  // ASH_LAUNCHER_APP_PLACEHOLDER_VIEW_H_