Move IN_OVERFLOW from Panel::ExpansionState to new enum.

chrome/browser/ui/panels/panel_strip.h

Index: chrome/browser/ui/panels/panel_strip.h
diff --git a/chrome/browser/ui/panels/panel_strip.h b/chrome/browser/ui/panels/panel_strip.h
index ef732df3a6179b716d2c0b71a8d853996c3afffa..79f33cfc824661a5bde8433fbe24b9a128a18465 100644
--- a/chrome/browser/ui/panels/panel_strip.h
+++ b/chrome/browser/ui/panels/panel_strip.h
@@ -46,8 +46,12 @@ class PanelStrip : public PanelMouseWatcherObserver {
   void Drag(int delta_x);
   void EndDragging(bool cancelled);
 
+  // Invoked when a panel's strip owner changes.
+  void OnPanelStripOwnerChanged(Panel* panel, Panel::StripOwner old_owner);
+
   // Invoked when a panel's expansion state changes.
-  void OnPanelExpansionStateChanged(Panel* panel);
+  void OnPanelExpansionStateChanged(Panel* panel,
+                                    Panel::ExpansionState old_state);
 
   // Invoked when the window size of the given panel is changed.
   void OnWindowSizeChanged(
@@ -66,6 +70,8 @@ class PanelStrip : public PanelMouseWatcherObserver {
   int GetBottomPositionForExpansionState(
       Panel::ExpansionState expansion_state) const;
 
+  void UpdateBoundsPerExpansionState(Panel* panel);
+
   // num_panels() and panels() only includes panels in the panel strip that
   // do NOT have a temporary layout.
   int num_panels() const { return panels_.size(); }