alternate ntp (cros/partial-win): add tab-related stuff and toolbar/tab background change

chrome/browser/ui/search/toolbar_search_animator_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_SEARCH_TOOLBAR_SEARCH_ANIMATOR_OBSERVER_H_
+#define CHROME_BROWSER_UI_SEARCH_TOOLBAR_SEARCH_ANIMATOR_OBSERVER_H_
+#pragma once
+
+class TabContents;
+
+namespace chrome {
+namespace search {
+
+// This class defines the observer interface for |ToolbarSearchAnimator|.
+class ToolbarSearchAnimatorObserver {
+ public:
+  // Called from ui::AnimationDelegate::AnimationProgressed.
+  virtual void OnToolbarBackgroundAnimatorProgressed() = 0;
+
+  // Called when animation is canceled and jumps to the end state.
+  // If animation is canceled because the active tab is deactivated or detached
+  // or closing, |tab_contents| contains the tab's contents.
+  // Otherwise, if animation is canceled because of mode change, |tab_contents|
+  // is NULL.
+  virtual void OnToolbarBackgroundAnimatorCanceled(
+      TabContents* tab_contents) = 0;
+
+ protected:
+  virtual ~ToolbarSearchAnimatorObserver() {}
+};
+
+}  // namespace search
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_UI_SEARCH_TOOLBAR_SEARCH_ANIMATOR_OBSERVER_H_