Add overflow indicator count on Windows.

chrome/browser/ui/panels/panel_overflow_indicator.h

Index: chrome/browser/ui/panels/panel_overflow_indicator.h
diff --git a/chrome/browser/ui/panels/panel_overflow_indicator.h b/chrome/browser/ui/panels/panel_overflow_indicator.h
new file mode 100644
index 0000000000000000000000000000000000000000..9166ef10f2cdbc23f2d22d463f8a768aa3b47cb1
--- /dev/null
+++ b/chrome/browser/ui/panels/panel_overflow_indicator.h
@@ -0,0 +1,33 @@
+// Copyright (c) 2011 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_PANELS_PANEL_OVERFLOW_INDICATOR_H_
+#define CHROME_BROWSER_UI_PANELS_PANEL_OVERFLOW_INDICATOR_H_
+#pragma once
+
+namespace gfx {
+class Rect;
+}
+
+// An interfac that encapsulates the logic to support showing the overflow
+// indicator count "+?" for different platform. This value denotes the number
+// of overflow panels that are not shown.
+class PanelOverflowIndicator {
+ public:
+  static PanelOverflowIndicator* Create();
+
+  virtual ~PanelOverflowIndicator() { }
+
+  virtual void SetBounds(const gfx::Rect& bounds) = 0;
+  virtual int GetHeight() const = 0;
+  virtual void SetCount(int count) = 0;
+  virtual void DrawAttention() = 0;
+  virtual void StopDrawingAttention() = 0;
+
+  // These are needed for testing purpose.
+  virtual int GetCount() const = 0;
+  virtual bool IsDrawingAttention() const = 0;
+};
+
+#endif  // CHROME_BROWSER_UI_PANELS_PANEL_OVERFLOW_INDICATOR_H_