Add methods needed for overflow panels to NativePanel interface.

chrome/browser/ui/panels/native_panel.h

Index: chrome/browser/ui/panels/native_panel.h
diff --git a/chrome/browser/ui/panels/native_panel.h b/chrome/browser/ui/panels/native_panel.h
index 4d1581d81b2273b86d9e09523001176f5c693616..3c712071836e78118c51d7e52af1df5cb754503c 100644
--- a/chrome/browser/ui/panels/native_panel.h
+++ b/chrome/browser/ui/panels/native_panel.h
@@ -70,6 +70,14 @@ class NativePanel {
       const gfx::Size& window_size) const = 0;
 
   virtual int TitleOnlyHeight() const = 0;
+
+  // Returns the size of the iconified panel. This is the size we use to draw
+  // the panel put in the overflow area.
+  virtual gfx::Size IconOnlySize() const = 0;
+
+  // Brings the panel to the top of the z-order without activating it. This
+  // will make sure that the panel is not obscured by other top-most windows.
+  virtual void EnsurePanelFullyVisible() = 0;
 };
 
 // A NativePanel utility interface used for accessing elements of the