Push API: define push event on Service Worker.

Source/modules/modules.gypi

Index: Source/modules/modules.gypi
diff --git a/Source/modules/modules.gypi b/Source/modules/modules.gypi
index 059148c7db082bd39b354704fa4a04a0ee0d67f6..688577b32c6c004c0ffc6fcbd43b25829b7a4da1 100644
--- a/Source/modules/modules.gypi
+++ b/Source/modules/modules.gypi
@@ -106,6 +106,7 @@
       'notifications/Notification.idl',
       'notifications/NotificationPermissionCallback.idl',
       'performance/WorkerPerformance.idl',
+      'push_messaging/PushEvent.idl',
       'push_messaging/PushManager.idl',
       'push_messaging/PushRegistration.idl',
       'quota/DeprecatedStorageInfo.idl',
@@ -225,6 +226,7 @@
       'performance/SharedWorkerPerformance.idl',
       'performance/WorkerGlobalScopePerformance.idl',
       'push_messaging/NavigatorPushManager.idl',
+      'push_messaging/ServiceWorkerGlobalScopePush.idl',
       'quota/NavigatorStorageQuota.idl',
       'quota/WindowQuota.idl',
       'quota/WorkerNavigatorStorageQuota.idl',
@@ -252,6 +254,7 @@
       'mediastream/RTCDTMFToneChangeEvent.idl',
       'mediastream/RTCDataChannelEvent.idl',
       'mediastream/RTCIceCandidateEvent.idl',
+      'push_messaging/PushEvent.idl',
       'serviceworkers/FetchEvent.idl',
       'serviceworkers/InstallEvent.idl',
       'serviceworkers/InstallPhaseEvent.idl',
@@ -606,10 +609,13 @@
       'push_messaging/PushController.h',
       'push_messaging/PushError.cpp',
       'push_messaging/PushError.h',
+      'push_messaging/PushEvent.cpp',
+      'push_messaging/PushEvent.h',
       'push_messaging/PushManager.cpp',
       'push_messaging/PushManager.h',
       'push_messaging/PushRegistration.cpp',
       'push_messaging/PushRegistration.h',
+      'push_messaging/ServiceWorkerGlobalScopePush.h',
       'quota/DOMWindowQuota.cpp',
       'quota/DOMWindowQuota.h',
       'quota/DeprecatedStorageInfo.cpp',