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diff --git a/chrome/browser/views/tabs/tab_overview_grid.h b/chrome/browser/views/tabs/tab_overview_grid.h
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+++ b/chrome/browser/views/tabs/tab_overview_grid.h
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+// Copyright (c) 2009 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_TAB_OVERVIEW_GRID_H_
+#define CHROME_BROWSER_VIEWS_TABS_TAB_OVERVIEW_GRID_H_
+
+#include "chrome/browser/tabs/tab_strip_model.h"
+#include "chrome/browser/views/tabs/grid.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "views/view.h"
+
+class TabOverviewCell;
+
+// TabOverviewGrid is used to provide a grid view of the contents of a tab
+// strip model. Each cell of the grid is a TabOverviewCell.
+class TabOverviewGrid : public Grid, public TabStripModelObserver {
+ public:
+
+  class Host {
+   public:
+    // Invoked when the preferred size of the TabOverviewGrid changes. The
+    // preferred size changes any the contents of the tab strip changes.
+    virtual void TabOverviewGridPreferredSizeChanged() = 0;
+
+    // Invoked when the user selects a cell in the grid.
+    virtual void SelectTabContents(TabContents* contents) = 0;
+
+   protected:
+    ~Host() {}
+  };
+
+  TabOverviewGrid();
+  virtual ~TabOverviewGrid();
+
+  // Sets the host.
+  void set_host(Host* host) { host_ = host; }
+
+  // The contents of the TabOverviewGrid are driven by that of the model.
+  void SetTabStripModel(TabStripModel* tab_strip_model);
+  TabStripModel* model() const { return model_; }
+
+  // TabStripModelObserver overrides.
+  virtual void TabInsertedAt(TabContents* contents,
+                             int index,
+                             bool foreground);
+  virtual void TabClosingAt(TabContents* contents, int index);
+  virtual void TabDetachedAt(TabContents* contents, int index);
+  virtual void TabMoved(TabContents* contents,
+                        int from_index,
+                        int to_index);
+  virtual void TabChangedAt(TabContents* contents, int index,
+                            bool loading_only);
+  virtual void TabStripEmpty();
+  // Currently don't care about these as we're not rendering the selection.
+  virtual void TabDeselectedAt(TabContents* contents, int index) { }
+  virtual void TabSelectedAt(TabContents* old_contents,
+                             TabContents* new_contents,
+                             int index,
+                             bool user_gesture) { }
+
+  // View overrides.
+  virtual bool OnMousePressed(const views::MouseEvent& event);
+  virtual bool OnMouseDragged(const views::MouseEvent& event);
+  virtual void OnMouseReleased(const views::MouseEvent& event, bool canceled);
+
+ private:
+  // DragInfo is used when the user presses the mouse on the grid. It indicates
+  // where the press occurred and whether the user is dragging the mouse.
+  struct DragInfo {
+    DragInfo() : index(-1), dragging(false) {}
+
+    // The index the user pressed that mouse at. If -1, the user didn't press
+    // on a valid location.
+    int index;
+
+    // Has the user started dragging?
+    bool dragging;
+
+    // The origin of the click.
+    gfx::Point origin;
+
+    // If true, we're moving the tab in the model. This is used to avoid
+    // resetting DragInfo when the model changes.
+    bool moving_tab;
+  };
+
+  void AddListeners();
+  void RemoveListeners();
+
+  // Recreates the contents of the grid from that of the model.
+  void Recreate();
+
+  // Returns the TabOverviewCell at the specified index.
+  TabOverviewCell* GetTabOverviewCellAt(int index);
+
+  // Configures a cell from the model.
+  void ConfigureChild(TabOverviewCell* child, int index);
+
+  // Invoked when the count of the model changes. Notifies the host the pref
+  // size changed.
+  void TabCountChanged();
+
+  // Updates |drag_info_| based on |location|.
+  void UpdateDrag(const gfx::Point& location);
+
+  TabStripModel* model_;
+
+  Host* host_;
+
+  DragInfo drag_info_;
+
+  DISALLOW_COPY_AND_ASSIGN(TabOverviewGrid);
+};
+
+#endif  // CHROME_BROWSER_VIEWS_TABS_TAB_OVERVIEW_GRID_H_