Move IN_OVERFLOW from Panel::ExpansionState to new enum.

chrome/browser/ui/panels/base_panel_browser_test.h

Index: chrome/browser/ui/panels/base_panel_browser_test.h
diff --git a/chrome/browser/ui/panels/base_panel_browser_test.h b/chrome/browser/ui/panels/base_panel_browser_test.h
index 9a08681a77988dda882828091a98acf77c866185..fcf0f137eaa2608a64763443e62953af34287b67 100644
--- a/chrome/browser/ui/panels/base_panel_browser_test.h
+++ b/chrome/browser/ui/panels/base_panel_browser_test.h
@@ -63,6 +63,8 @@ class BasePanelBrowserTest : public InProcessBrowserTest {
   void WaitForPanelActiveState(Panel* panel, ActiveState state);
   void WaitForWindowSizeAvailable(Panel* panel);
   void WaitForBoundsAnimationFinished(Panel* panel);
+  void WaitForLayoutStateChanged(Panel* panel,
+                                 Panel::LayoutState layout_state);
   void WaitForExpansionStateChanged(Panel* panel,
                                     Panel::ExpansionState expansion_state);
 
@@ -72,6 +74,8 @@ class BasePanelBrowserTest : public InProcessBrowserTest {
                                            Extension::Location location,
                                            const DictionaryValue& extra_value);
 
+  void ClickPanelTitlebar(Panel* panel);
+
   static void MoveMouse(const gfx::Point& position);
   static void CloseWindowAndWait(Browser* browser);
   static std::string MakePanelName(int index);