Support detaching/attaching panels via inter-strip drags.

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 e96f5040127f07874322f93a3c11f2d73d197d41..e7b6cb045ac67d8c84dda89acbd0b73d616b97f2 100644
--- a/chrome/browser/ui/panels/base_panel_browser_test.h
+++ b/chrome/browser/ui/panels/base_panel_browser_test.h
@@ -80,6 +80,12 @@ class BasePanelBrowserTest : public InProcessBrowserTest {
                                const gfx::Rect& bounds);
   Panel* CreatePanel(const std::string& panel_name);
 
+  Panel* CreateDockedPanel(const std::string& name, const gfx::Rect& bounds);
+  Panel* CreateDetachedPanel(const std::string& name, const gfx::Rect& bounds);
+  // The caller should have already created enough docked panels to trigger
+  // overflow.
+  Panel* CreateOverflowPanel(const std::string& name, const gfx::Rect& bounds);
+
   void WaitForPanelAdded(Panel* panel);
   void WaitForPanelRemoved(Panel* panel);
   void WaitForPanelActiveState(Panel* panel, ActiveState state);