views: Extract TabIconViewModel into its own header file.

chrome/browser/ui/views/tab_icon_view_model.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_VIEWS_TAB_ICON_VIEW_MODEL_H_
+#define CHROME_BROWSER_UI_VIEWS_TAB_ICON_VIEW_MODEL_H_
+
+namespace gfx {
+class ImageSkia;
+}
+
+namespace chrome {
+
+// Classes implement this interface to provide state for the TabIconView.
+class TabIconViewModel {
+ public:
+  // Returns true if the TabIconView should show a loading animation.
+  virtual bool ShouldTabIconViewAnimate() const = 0;
+
+  // Returns the favicon to display in the icon view
+  virtual gfx::ImageSkia GetFaviconForTabIconView() = 0;
+
+ protected:
+  virtual ~TabIconViewModel() {}
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_UI_VIEWS_TAB_ICON_VIEW_MODEL_H_