Add rendering context and rendering 2D context to OffscreenCanvas

third_party/WebKit/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 132 matching lines @@
       'navigatorconnect/CrossOriginServiceWorkerClient.idl',
       'navigatorconnect/ServicePort.idl',
       'navigatorconnect/ServicePortConnectEvent.idl',
       'navigatorconnect/ServicePortCollection.idl',
       'netinfo/NetworkInformation.idl',
       'nfc/MessageCallback.idl',
       'nfc/NFC.idl',
       'notifications/Notification.idl',
       'notifications/NotificationEvent.idl',
       'notifications/NotificationPermissionCallback.idl',
+      'offscreencanvas/OffscreenCanvas.idl',
+      'offscreencanvas2d/OffscreenCanvasRenderingContext2D.idl',
       'permissions/Permissions.idl',
       'permissions/PermissionStatus.idl',
       'plugins/MimeType.idl',
       'plugins/MimeTypeArray.idl',
       'plugins/Plugin.idl',
       'plugins/PluginArray.idl',
       'presentation/Presentation.idl',
       'presentation/PresentationAvailability.idl',
       'presentation/PresentationConnection.idl',
       'presentation/PresentationConnectionAvailableEvent.idl',
@@ skipping 1124 matching lines @@
       'notifications/NotificationData.cpp',
       'notifications/NotificationData.h',
       'notifications/NotificationEvent.cpp',
       'notifications/NotificationEvent.h',
       'notifications/NotificationPermissionCallback.h',
       'notifications/NotificationPermissionClient.cpp',
       'notifications/NotificationPermissionClient.h',
       'notifications/ServiceWorkerGlobalScopeNotifications.h',
       'notifications/ServiceWorkerRegistrationNotifications.cpp',
       'notifications/ServiceWorkerRegistrationNotifications.h',
+      'offscreencanvas/OffscreenCanvas.cpp',
+      'offscreencanvas/OffscreenCanvas.h',
+      'offscreencanvas/OffscreenCanvasRenderingContext.cpp',
+      'offscreencanvas/OffscreenCanvasRenderingContext.h',
+      'offscreencanvas/OffscreenCanvasRenderingContextFactory.h',
+      'offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp',
+      'offscreencanvas2d/OffscreenCanvasRenderingContext2D.h',
       'permissions/NavigatorPermissions.cpp',
       'permissions/NavigatorPermissions.h',
       'permissions/PermissionController.cpp',
       'permissions/PermissionController.h',
       'permissions/Permissions.cpp',
       'permissions/Permissions.h',
       'permissions/PermissionCallback.cpp',
       'permissions/PermissionCallback.h',
       'permissions/PermissionsCallback.cpp',
       'permissions/PermissionsCallback.h',
@@ skipping 625 matching lines @@
       'webaudio/AudioBasicProcessorHandlerTest.cpp',
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }