Add skeleton implementation of ExtensionPushMessagingEventRouter.

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index b4f927a3d6e276d662c5977cd4a6e4d33219b5a0..781c1c34572ede49e8175fbb5a62c98fe349df56 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -32,6 +32,7 @@
 #include "chrome/browser/extensions/api/cookies/cookies_api.h"
 #include "chrome/browser/extensions/api/declarative/rules_registry_service.h"
 #include "chrome/browser/extensions/api/managed_mode/managed_mode_api.h"
+#include "chrome/browser/extensions/api/push_messaging/push_messaging_api.h"
 #include "chrome/browser/extensions/api/web_navigation/web_navigation_api.h"
 #include "chrome/browser/extensions/app_notification_manager.h"
 #include "chrome/browser/extensions/app_sync_data.h"
@@ -495,6 +496,9 @@ void ExtensionService::InitEventRouters() {
   managed_mode_event_router_.reset(
       new extensions::ExtensionManagedModeEventRouter(profile_));
   managed_mode_event_router_->Init();
+  push_messaging_event_router_.reset(
+      new extensions::PushMessagingEventRouter(profile_));
+  push_messaging_event_router_->Init();
 
 #if defined(OS_CHROMEOS)
   FileBrowserEventRouterFactory::GetForProfile(