Support chrome.windows extension API events for browserless Panels.

chrome/browser/extensions/window_controller.h

Index: chrome/browser/extensions/window_controller.h
diff --git a/chrome/browser/extensions/window_controller.h b/chrome/browser/extensions/window_controller.h
index 6e82bed8860cb248c1b1b1735e84a41c2f91faa0..e6e45541ae92f23febc0e285f46fa2ef7a754ddc 100644
--- a/chrome/browser/extensions/window_controller.h
+++ b/chrome/browser/extensions/window_controller.h
@@ -29,6 +29,8 @@ class Extension;
 
 // This API needs to be implemented by any window that might be accessed
 // through chrome.windows or chrome.tabs (e.g. browser windows and panels).
+// Subclasses must add/remove themselves from the WindowControllerList
+// upon construction/destruction.

[stevenjb, 2012/07/23 18:02:42]

Hm, I'm going back and forth on this. I'm not real fond of forced duplicate
code, and was thinking that rather than requiring each subclass to add/remove
itself from the list, we could make the destructor private and create a Destroy
function that first removes the instance from the list and then destroys it. On
the other hand, that would prevent the use of scoped containers, so maybe that's
not a good idea. I guess I'm OK either way, i.e. it's fine as-is.

 class WindowController {
  public:
   enum Reason {