Support chrome.windows extension API events for browserless Panels.

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 4a3d15db8a1e7e5c98bd76e2f9728746f7db8b03..3e4de7f1b88a225c2cd49f2c4f7441a1e1698eb5 100644
--- a/chrome/browser/ui/panels/panel.h
+++ b/chrome/browser/ui/panels/panel.h
@@ -20,6 +20,7 @@
 
 class Browser;
 class BrowserWindow;
+class ExtensionPanelEventRouter;
 class ExtensionWindowController;
 class GURL;
 class NativePanel;
@@ -326,6 +327,10 @@ class Panel : public BaseWindow,
   // Prepares a title string for display (removes embedded newlines, etc).
   static void FormatTitleForDisplay(string16* title);
 
+  // Used to send Panel window events to listeners in extension process
+  // renderers. May return NULL.
+  ExtensionPanelEventRouter* GetEventRouter();
+
   // The application name that is also the name of the window when the
   // page content does not provide a title.
   // This name should be set when the panel is created.