Added Web Share (navigator.share) experimental web API (stub).

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
     # ways.
     'extra_blink_module_idl_files': [],
     'extra_blink_module_files': [],
     # Files for which bindings (.cpp and .h files) will be generated
     'modules_idl_files': [
       '<@(extra_blink_module_idl_files)',
       'app_banner/AppBannerPromptResult.idl',
       'app_banner/BeforeInstallPromptEvent.idl',
       'background_sync/SyncEvent.idl',
       'background_sync/SyncManager.idl',
+      'ballista/Actions.idl',
       'battery/BatteryManager.idl',
       'bluetooth/Bluetooth.idl',
       'bluetooth/BluetoothAdvertisingData.idl',
       'bluetooth/BluetoothDevice.idl',
       'bluetooth/BluetoothCharacteristicProperties.idl',
       'bluetooth/BluetoothRemoteGATTCharacteristic.idl',
       'bluetooth/BluetoothRemoteGATTServer.idl',
       'bluetooth/BluetoothRemoteGATTService.idl',
       'bluetooth/BluetoothUUID.idl',
       'cachestorage/Cache.idl',
@@ skipping 294 matching lines @@
       'webusb/USBOutTransferResult.idl',
       'worklet/Worklet.idl',
       'worklet/WorkletConsole.idl',
       'worklet/WorkletGlobalScope.idl',
     ],
     # 'partial interface' or target (right side of) 'implements'
     'modules_dependency_idl_files': [
       'audio_output_devices/HTMLMediaElementAudioOutputDevice.idl',
       'background_sync/ServiceWorkerGlobalScopeSync.idl',
       'background_sync/ServiceWorkerRegistrationSync.idl',
+      'ballista/NavigatorActions.idl',
       'battery/NavigatorBattery.idl',
       'beacon/NavigatorBeacon.idl',
       'bluetooth/NavigatorBluetooth.idl',
       'cachestorage/WindowCacheStorage.idl',
       'cachestorage/WorkerCacheStorage.idl',
       'canvas/HTMLCanvasElementModule.idl',
       'canvas2d/CanvasPathMethods.idl',
       'credentialmanager/NavigatorCredentials.idl',
       'crypto/WindowCrypto.idl',
       'crypto/WorkerGlobalScopeCrypto.idl',
@@ skipping 463 matching lines @@
       'background_sync/ServiceWorkerRegistrationSync.cpp',
       'background_sync/ServiceWorkerRegistrationSync.h',
       'background_sync/SyncCallbacks.cpp',
       'background_sync/SyncCallbacks.h',
       'background_sync/SyncError.cpp',
       'background_sync/SyncError.h',
       'background_sync/SyncEvent.cpp',
       'background_sync/SyncEvent.h',
       'background_sync/SyncManager.cpp',
       'background_sync/SyncManager.h',
+      'ballista/Actions.cpp',
+      'ballista/Actions.h',
+      'ballista/NavigatorActions.cpp',
+      'ballista/NavigatorActions.h',
       'battery/BatteryDispatcher.cpp',
       'battery/BatteryDispatcher.h',
       'battery/BatteryManager.cpp',
       'battery/BatteryManager.h',
       'battery/NavigatorBattery.cpp',
       'battery/NavigatorBattery.h',
       'beacon/NavigatorBeacon.cpp',
       'beacon/NavigatorBeacon.h',
       'bluetooth/Bluetooth.h',
       'bluetooth/Bluetooth.cpp',
@@ skipping 1146 matching lines @@
       'webaudio/AudioBasicProcessorHandlerTest.cpp',
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }