Support chrome.windows extension API events for browserless Panels.

chrome/browser/extensions/browser_extension_window_controller.cc

Index: chrome/browser/extensions/browser_extension_window_controller.cc
diff --git a/chrome/browser/extensions/browser_extension_window_controller.cc b/chrome/browser/extensions/browser_extension_window_controller.cc
index 32f2900388eacd23799fee26b652fb8c7023bd68..54792bc536cbe32b235e18ce089f258392a964d6 100644
--- a/chrome/browser/extensions/browser_extension_window_controller.cc
+++ b/chrome/browser/extensions/browser_extension_window_controller.cc
@@ -6,6 +6,7 @@
 
 #include "chrome/browser/extensions/api/tabs/tabs_constants.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
+#include "chrome/browser/extensions/window_controller_list.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_id.h"
 #include "chrome/browser/ui/browser.h"
@@ -17,6 +18,11 @@ BrowserExtensionWindowController::BrowserExtensionWindowController(
     Browser* browser)
     : extensions::WindowController(browser->window(), browser->profile()),
       browser_(browser) {
+  extensions::WindowControllerList::GetInstance()->AddExtensionWindow(this);
+}
+
+BrowserExtensionWindowController::~BrowserExtensionWindowController() {
+  extensions::WindowControllerList::GetInstance()->RemoveExtensionWindow(this);
 }
 
 int BrowserExtensionWindowController::GetWindowId() const {