[SiteChip] Add the basic painting of the site chip button

chrome/browser/ui/views/toolbar/site_chip_view.h

+// Copyright (c) 2013 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_TOOLBAR_SITE_CHIP_VIEW_H_
+#define CHROME_BROWSER_UI_VIEWS_TOOLBAR_SITE_CHIP_VIEW_H_
+
+#include "chrome/browser/ui/views/location_bar/location_icon_view.h"
+#include "chrome/browser/ui/views/toolbar/toolbar_button.h"
+#include "ui/views/controls/button/button.h"
+
+class ToolbarView;
+
+namespace content {
+class WebContents;
+}
+
+namespace gfx {
+class Canvas;
+}
+
+namespace views {
+class Button;
+class Label;
+}
+
+class SiteChipView : public ToolbarButton,
+                     public views::ButtonListener {
+ public:
+  explicit SiteChipView(ToolbarView* toolbar_view);
+  virtual ~SiteChipView();
+
+  void Init();
+
+  // Returns true if the site chip experiment is enabled and thus the site chip
+  // should be shown in the toolbar.
+  bool ShouldShow();
+
+  // Recalculates the contents of the Site Chip based on the displayed tab.
+  void Update(content::WebContents* tab);
+
+  views::ImageView* location_icon_view() { return location_icon_view_; }
+
+  // ToolbarButton:
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual void Layout() OVERRIDE;
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+
+  // views::ButtonListener:
+  virtual void ButtonPressed(views::Button* sender,
+                             const ui::Event& event) OVERRIDE;
+
+ private:
+  ToolbarView* toolbar_view_;
+  views::Label* host_label_;
+  LocationIconView* location_icon_view_;
+  scoped_ptr<views::Painter> background_painter_;
+
+  DISALLOW_COPY_AND_ASSIGN(SiteChipView);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_SITE_CHIP_VIEW_H_