Panel Overflow on Mac.

chrome/browser/ui/panels/panel.h

Index: chrome/browser/ui/panels/panel.h
diff --git a/chrome/browser/ui/panels/panel.h b/chrome/browser/ui/panels/panel.h
index 26714f15daaa0ebff05728b7abad1eb44f089218..637ce47057dbfdd1fed9774bfc20aa0786d1ef1d 100644
--- a/chrome/browser/ui/panels/panel.h
+++ b/chrome/browser/ui/panels/panel.h
@@ -18,6 +18,14 @@
 class NativePanel;
 class PanelManager;
 
+// Type of the panel strip which currently manages the panel location,
+// visual state and size.
+// TODO(jianli): When we have PanelStrip base class, move it into PanelStrip.
+enum PanelStripType {
+  DOCKED_STRIP,
+  OVERFLOW_STRIP
+};
+
 // A platform independent implementation of BrowserWindow for Panels.  This
 // class would get the first crack at all the BrowserWindow calls for Panels and
 // do one or more of the following:
@@ -71,6 +79,10 @@ class Panel : public BrowserWindow,
   // top-most windows.
   void EnsureFullyVisible();
 
+  // TODO(jianli): When we can use Panel::currentStrip()->type(), the
+  // 'newPanelStrip' parameter can be removed.
+  void ApplyVisualStyleForStrip(PanelStripType newPanelStrip);
+
   int TitleOnlyHeight() const;
 
   // Returns the size of the panel when it is iconified, as shown on the