Introduce WorkletGlobalScopeProxy interface.

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 16 matching lines @@
       'bluetooth/BluetoothRemoteGATTService.idl',
       'bluetooth/BluetoothUUID.idl',
       'cachestorage/Cache.idl',
       'cachestorage/CacheStorage.idl',
       'canvas2d/CanvasGradient.idl',
       'canvas2d/CanvasPattern.idl',
       'canvas2d/CanvasRenderingContext2D.idl',
       'canvas2d/Path2D.idl',
       'compositorworker/CompositorWorker.idl',
       'compositorworker/CompositorWorkerGlobalScope.idl',
+      'compositorworker/CompositorWorkletGlobalScope.idl',
       'credentialmanager/Credential.idl',
       'credentialmanager/CredentialsContainer.idl',
       'credentialmanager/FederatedCredential.idl',
       'credentialmanager/PasswordCredential.idl',
       'credentialmanager/SiteBoundCredential.idl',
       'crypto/Crypto.idl',
       'crypto/CryptoKey.idl',
       'crypto/SubtleCrypto.idl',
       'csspaint/Geometry.idl',
       'csspaint/PaintRenderingContext2D.idl',
@@ skipping 286 matching lines @@
       'audio_output_devices/HTMLMediaElementAudioOutputDevice.idl',
       'background_sync/ServiceWorkerGlobalScopeSync.idl',
       'background_sync/ServiceWorkerRegistrationSync.idl',
       'battery/NavigatorBattery.idl',
       'beacon/NavigatorBeacon.idl',
       'bluetooth/NavigatorBluetooth.idl',
       'cachestorage/WindowCacheStorage.idl',
       'cachestorage/WorkerCacheStorage.idl',
       'canvas/HTMLCanvasElementModule.idl',
       'canvas2d/CanvasPathMethods.idl',
+      'compositorworker/WindowCompositorWorklet.idl',
       'credentialmanager/NavigatorCredentials.idl',
       'crypto/WindowCrypto.idl',
       'crypto/WorkerGlobalScopeCrypto.idl',
       'csspaint/WindowPaintWorklet.idl',
       'device_light/WindowDeviceLight.idl',
       'device_orientation/WindowDeviceMotion.idl',
       'device_orientation/WindowDeviceOrientation.idl',
       'donottrack/NavigatorDoNotTrack.idl',
       'encryptedmedia/HTMLMediaElementEncryptedMedia.idl',
       'encryptedmedia/NavigatorRequestMediaKeySystemAccess.idl',
@@ skipping 556 matching lines @@
       'canvas2d/HitRegion.h',
       'canvas2d/Path2D.h',
       'compositorworker/CompositorWorker.cpp',
       'compositorworker/CompositorWorker.h',
       'compositorworker/CompositorWorkerGlobalScope.cpp',
       'compositorworker/CompositorWorkerGlobalScope.h',
       'compositorworker/CompositorWorkerMessagingProxy.cpp',
       'compositorworker/CompositorWorkerMessagingProxy.h',
       'compositorworker/CompositorWorkerThread.cpp',
       'compositorworker/CompositorWorkerThread.h',
+      'compositorworker/CompositorWorklet.cpp',
+      'compositorworker/CompositorWorklet.h',
+      'compositorworker/CompositorWorkletGlobalScope.cpp',
+      'compositorworker/CompositorWorkletGlobalScope.h',
+      'compositorworker/CompositorWorkletGlobalScopeProxy.cpp',
+      'compositorworker/CompositorWorkletGlobalScopeProxy.h',
+      'compositorworker/CompositorWorkletThread.cpp',
+      'compositorworker/CompositorWorkletThread.h',
+      'compositorworker/WindowCompositorWorklet.cpp',
+      'compositorworker/WindowCompositorWorklet.h',
       'credentialmanager/Credential.cpp',
       'credentialmanager/Credential.h',
       'credentialmanager/CredentialManagerClient.cpp',
       'credentialmanager/CredentialManagerClient.h',
       'credentialmanager/CredentialsContainer.cpp',
       'credentialmanager/CredentialsContainer.h',
       'credentialmanager/FederatedCredential.cpp',
       'credentialmanager/FederatedCredential.h',
       'credentialmanager/NavigatorCredentials.cpp',
       'credentialmanager/NavigatorCredentials.h',
@@ skipping 1003 matching lines @@
       'webusb/USBEndpoint.cpp',
       'webusb/USBEndpoint.h',
       'webusb/USBInTransferResult.h',
       'webusb/USBInterface.cpp',
       'webusb/USBInterface.h',
       'webusb/USBIsochronousInTransferPacket.h',
       'webusb/USBIsochronousInTransferResult.h',
       'webusb/USBIsochronousOutTransferPacket.h',
       'webusb/USBIsochronousOutTransferResult.h',
       'webusb/USBOutTransferResult.h',
+      'worklet/ThreadedWorkletGlobalScope.cpp',
+      'worklet/ThreadedWorkletGlobalScope.h',
+      'worklet/ThreadedWorkletGlobalScopeProxy.h',
+      'worklet/ThreadedWorkletGlobalScopeProxy.cpp',
       'worklet/Worklet.cpp',
       'worklet/Worklet.h',
+      'worklet/WorkletThread.cpp',
+      'worklet/WorkletThread.h',
+      'worklet/WorkletThreadStartupData.h',
     ],
     # 'partial interface' or target (right side of) 'implements'
     'modules_testing_dependency_idl_files' : [
       'accessibility/testing/InternalsAccessibility.idl',
       'mediastream/testing/InternalsRTCCertificate.idl',
       'navigatorcontentutils/testing/InternalsNavigatorContentUtils.idl',
       'serviceworkers/testing/InternalsServiceWorker.idl',
       'speech/testing/InternalsSpeechSynthesis.idl',
       'vibration/testing/InternalsVibration.idl',
       'webaudio/testing/InternalsWebAudio.idl',
@@ skipping 67 matching lines @@
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'webdatabase/QuotaTrackerTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }