Implement the ServiceWorkerRegistration.getNotifications() API.

Source/modules/modules.gypi

 {
   'includes': [
     '../core/core_generated.gypi',
     'modules_generated.gypi',
   ],
   'variables': {
     # Experimental hooks for embedder to provide extra IDL and source files.
     #
     # Note: this is not a supported API. If you rely on this, you will be broken
     # from time to time as the code generator changes in backward incompatible
@@ skipping 313 matching lines @@
       'gamepad/GamepadEventInit.idl',
       'geofencing/CircularGeofencingRegionInit.idl',
       'geolocation/PositionOptions.idl',
       'indexeddb/IDBIndexParameters.idl',
       'indexeddb/IDBObjectStoreParameters.idl',
       'indexeddb/IDBVersionChangeEventInit.idl',
       'mediastream/MediaStreamEventInit.idl',
       'mediastream/RTCDTMFToneChangeEventInit.idl',
       'mediastream/RTCIceCandidateInit.idl',
       'mediastream/RTCSessionDescriptionInit.idl',
+      'notifications/GetNotificationOptions.idl',
       'notifications/NotificationEventInit.idl',
       'notifications/NotificationOptions.idl',
       'presentation/AvailableChangeEventInit.idl',
       'presentation/DefaultSessionStartEventInit.idl',
       'push_messaging/PushEventInit.idl',
       'serviceworkers/CacheQueryOptions.idl',
       'serviceworkers/ClientQueryOptions.idl',
       'serviceworkers/ExtendableEventInit.idl',
       'serviceworkers/InstallEventInit.idl',
       'serviceworkers/RegistrationOptions.idl',
@@ skipping 48 matching lines @@
       '<(blink_modules_output_dir)/indexeddb/IDBVersionChangeEventInit.cpp',
       '<(blink_modules_output_dir)/indexeddb/IDBVersionChangeEventInit.h',
       '<(blink_modules_output_dir)/mediastream/MediaStreamEventInit.cpp',
       '<(blink_modules_output_dir)/mediastream/MediaStreamEventInit.h',
       '<(blink_modules_output_dir)/mediastream/RTCDTMFToneChangeEventInit.cpp',
       '<(blink_modules_output_dir)/mediastream/RTCDTMFToneChangeEventInit.h',
       '<(blink_modules_output_dir)/mediastream/RTCIceCandidateInit.cpp',
       '<(blink_modules_output_dir)/mediastream/RTCIceCandidateInit.h',
       '<(blink_modules_output_dir)/mediastream/RTCSessionDescriptionInit.cpp',
       '<(blink_modules_output_dir)/mediastream/RTCSessionDescriptionInit.h',
+      '<(blink_modules_output_dir)/notifications/GetNotificationOptions.cpp',
+      '<(blink_modules_output_dir)/notifications/GetNotificationOptions.h',
       '<(blink_modules_output_dir)/notifications/NotificationEventInit.cpp',
       '<(blink_modules_output_dir)/notifications/NotificationEventInit.h',
       '<(blink_modules_output_dir)/notifications/NotificationOptions.cpp',
       '<(blink_modules_output_dir)/notifications/NotificationOptions.h',
       '<(blink_modules_output_dir)/presentation/AvailableChangeEventInit.cpp',
       '<(blink_modules_output_dir)/presentation/AvailableChangeEventInit.h',
       '<(blink_modules_output_dir)/presentation/DefaultSessionStartEventInit.cpp',
       '<(blink_modules_output_dir)/presentation/DefaultSessionStartEventInit.h',
       '<(blink_modules_output_dir)/push_messaging/PushEventInit.cpp',
       '<(blink_modules_output_dir)/push_messaging/PushEventInit.h',
@@ skipping 873 matching lines @@
       'indexeddb/IDBKeyPathTest.cpp',
       'indexeddb/IDBRequestTest.cpp',
       'indexeddb/IDBTransactionTest.cpp',
       'serviceworkers/CacheTest.cpp',
       'serviceworkers/ServiceWorkerContainerTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }