Support chrome.windows extension API events for browserless Panels.

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index 3673dc96daa12a8741f5bfe17dc7b53f3674b16e..c659054b258ef8fabee6b7400d9fc3859341beec 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -55,6 +55,7 @@ class ExtensionFontSettingsEventRouter;
 class ExtensionGlobalError;
 class ExtensionManagedModeEventRouter;
 class ExtensionManagementEventRouter;
+class ExtensionPanelEventRouter;
 class ExtensionPreferenceEventRouter;
 class ExtensionSyncData;
 class ExtensionToolbarModel;
@@ -502,6 +503,8 @@ class ExtensionService
     return browser_event_router_.get();
   }
 
+  ExtensionPanelEventRouter* GetPanelEventRouter();
+
 #if defined(OS_CHROMEOS)
   chromeos::ExtensionBluetoothEventRouter* bluetooth_event_router() {
     return bluetooth_event_router_.get();
@@ -802,6 +805,8 @@ class ExtensionService
 
   scoped_ptr<ExtensionBrowserEventRouter> browser_event_router_;
 
+  scoped_ptr<ExtensionPanelEventRouter> panel_event_router_;
+
   scoped_ptr<ExtensionPreferenceEventRouter> preference_event_router_;
 
   scoped_ptr<BookmarkExtensionEventRouter> bookmark_event_router_;