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diff --git a/chrome/browser/views/tabs/side_tab_strip_model.h b/chrome/browser/views/tabs/side_tab_strip_model.h
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+// Copyright (c) 2010 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_VIEWS_TABS_SIDE_TAB_STRIP_MODEL_H_
+#define CHROME_BROWSER_VIEWS_TABS_SIDE_TAB_STRIP_MODEL_H_
+
+#include "base/string16.h"
+
+class SkBitmap;
+
+// A model interface implemented by an object that can provide information
+// about SideTabs in a SideTabStrip.
+class SideTabStripModel {
+ public:
+  // Returns metadata about the tab at the specified index.
+  virtual SkBitmap GetIcon(int index) const = 0;
+  virtual string16 GetTitle(int index) const = 0;
+  virtual bool IsSelected(int index) const = 0;
+
+  // Different types of network activity for a tab. The NetworkState of a tab
+  // may be used to alter the UI (e.g. show different kinds of loading
+  // animations).
+  enum NetworkState {
+    NetworkState_None,    // no network activity.
+    NetworkState_Waiting, // waiting for a connection.
+    NetworkState_Loading  // connected, transferring data.
+  };
+
+  // Returns the NetworkState of the tab at the specified index.
+  virtual NetworkState GetNetworkState(int index) const = 0;
+
+  // Select the tab at the specified index in the model.
+  virtual void SelectTab(int index) = 0;
+
+  // Closes the tab at the specified index in the model.
+  virtual void CloseTab(int index) = 0;
+};
+
+#endif  // CHROME_BROWSER_VIEWS_TABS_SIDE_TAB_STRIP_MODEL_H_
+