Add initial Blink-side support for the Screen Orientation API

Source/modules/modules.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
@@ skipping 186 matching lines @@
       'mediastream/NavigatorMediaStream.idl',
       'mediastream/URLMediaStream.idl',
       'navigatorcontentutils/NavigatorContentUtils.idl',
       'notifications/WindowNotifications.idl',
       'notifications/WorkerGlobalScopeNotifications.idl',
       'performance/SharedWorkerPerformance.idl',
       'performance/WorkerGlobalScopePerformance.idl',
       'quota/NavigatorStorageQuota.idl',
       'quota/WindowQuota.idl',
       'quota/WorkerNavigatorStorageQuota.idl',
+      'screen_orientation/ScreenOrientation.idl',
       'serviceworkers/NavigatorServiceWorker.idl',
       'speech/WindowSpeechSynthesis.idl',
       'vibration/NavigatorVibration.idl',
       'webdatabase/WindowWebDatabase.idl',
       'webdatabase/WorkerGlobalScopeWebDatabase.idl',
       'webmidi/NavigatorWebMIDI.idl',
     ],
     'modules_files': [
       '<@(extra_blink_module_files)',
       'crypto/Algorithm.cpp',
@@ skipping 318 matching lines @@
       'quota/StorageQuota.cpp',
       'quota/StorageQuota.h',
       'quota/StorageQuotaCallback.h',
       'quota/StorageQuotaCallbacksImpl.cpp',
       'quota/StorageQuotaCallbacksImpl.h',
       'quota/StorageQuotaClient.cpp',
       'quota/StorageQuotaClient.h',
       'quota/StorageUsageCallback.h',
       'quota/WorkerNavigatorStorageQuota.cpp',
       'quota/WorkerNavigatorStorageQuota.h',
+      'screen_orientation/ScreenOrientation.cpp',
+      'screen_orientation/ScreenOrientation.h',
+      'screen_orientation/ScreenOrientationClient.h',
+      'screen_orientation/ScreenOrientationController.cpp',
+      'screen_orientation/ScreenOrientationController.h',
       'serviceworkers/InstallEvent.cpp',
       'serviceworkers/InstallEvent.h',
       'serviceworkers/InstallPhaseEvent.cpp',
       'serviceworkers/InstallPhaseEvent.h',
       'serviceworkers/ServiceWorker.cpp',
       'serviceworkers/ServiceWorker.h',
       'serviceworkers/ServiceWorkerError.cpp',
       'serviceworkers/ServiceWorkerError.h',
       'serviceworkers/NavigatorServiceWorker.cpp',
       'serviceworkers/NavigatorServiceWorker.h',
@@ skipping 248 matching lines @@
       'websockets/WebSocketHandshake.cpp',
       'websockets/WebSocketHandshake.h',
       'websockets/WebSocketPerMessageDeflate.cpp',
       'websockets/WebSocketPerMessageDeflate.h',
       'websockets/WorkerThreadableWebSocketChannel.cpp',
       'websockets/WorkerThreadableWebSocketChannel.h',
     ],
     # 'partial interface' or target (right side of) 'implements'
     'modules_testing_dependency_idl_files' : [
       'geolocation/testing/InternalsGeolocation.idl',
+      'screen_orientation/testing/InternalsScreenOrientation.idl',
       'speech/testing/InternalsSpeechSynthesis.idl',
       'vibration/testing/InternalsVibration.idl',
     ],
     'modules_testing_files': [
       'geolocation/testing/InternalsGeolocation.cpp',
       'geolocation/testing/InternalsGeolocation.h',
       'geolocation/testing/GeolocationClientMock.h',
       'geolocation/testing/GeolocationClientMock.cpp',
+      'screen_orientation/testing/InternalsScreenOrientation.cpp',
+      'screen_orientation/testing/InternalsScreenOrientation.h',
+      'screen_orientation/testing/ScreenOrientationClientMock.cpp',
+      'screen_orientation/testing/ScreenOrientationClientMock.h',
       'speech/testing/InternalsSpeechSynthesis.cpp',
       'speech/testing/InternalsSpeechSynthesis.h',
       'speech/testing/PlatformSpeechSynthesizerMock.cpp',
       'speech/testing/PlatformSpeechSynthesizerMock.h',
       'vibration/testing/InternalsVibration.cpp',
       'vibration/testing/InternalsVibration.h',
     ],
     'modules_unittest_files': [
       'indexeddb/IDBKeyPathTest.cpp',
       'indexeddb/IDBRequestTest.cpp',
       'indexeddb/IDBTransactionTest.cpp',
       'websockets/WebSocketDeflaterTest.cpp',
       'websockets/WebSocketExtensionDispatcherTest.cpp',
       'websockets/WebSocketExtensionParserTest.cpp',
       'websockets/WebSocketPerMessageDeflateTest.cpp',
     ],
   },
 }