Add Python flow to bindings generation, move dummy-generating IDL files over

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': [],
 
-    'modules_idl_files': [
+    'perl_modules_idl_files': [
       '<@(extra_blink_module_idl_files)',
       'crypto/AesCbcParams.idl',
       'crypto/AesKeyGenParams.idl',
       'crypto/Algorithm.idl',
       'crypto/Crypto.idl',
       'crypto/CryptoOperation.idl',
       'crypto/Key.idl',
       'crypto/SubtleCrypto.idl',
-      'crypto/WindowCrypto.idl',
       'crypto/WorkerCrypto.idl',
-      'crypto/WorkerGlobalScopeCrypto.idl',
       'device_orientation/DeviceAcceleration.idl',
       'device_orientation/DeviceMotionEvent.idl',
       'device_orientation/DeviceRotationRate.idl',
-      'donottrack/NavigatorDoNotTrack.idl',
       'encryptedmedia/MediaKeyMessageEvent.idl',
       'encryptedmedia/MediaKeyNeededEvent.idl',
       'encryptedmedia/MediaKeys.idl',
       'encryptedmedia/MediaKeySession.idl',
       'filesystem/DOMFileSystem.idl',
       'filesystem/DOMFileSystemSync.idl',
-      'filesystem/DataTransferItemFileSystem.idl',
       'filesystem/DirectoryEntry.idl',
       'filesystem/DirectoryEntrySync.idl',
       'filesystem/DirectoryReader.idl',
       'filesystem/DirectoryReaderSync.idl',
       'filesystem/EntriesCallback.idl',
       'filesystem/Entry.idl',
       'filesystem/EntryArray.idl',
       'filesystem/EntryArraySync.idl',
       'filesystem/EntryCallback.idl',
       'filesystem/EntrySync.idl',
       'filesystem/ErrorCallback.idl',
       'filesystem/FileCallback.idl',
       'filesystem/FileEntry.idl',
       'filesystem/FileEntrySync.idl',
       'filesystem/FileSystemCallback.idl',
       'filesystem/FileWriter.idl',
       'filesystem/FileWriterCallback.idl',
       'filesystem/FileWriterSync.idl',
-      'filesystem/HTMLInputElementFileSystem.idl',
       'filesystem/Metadata.idl',
       'filesystem/MetadataCallback.idl',
-      'filesystem/WindowFileSystem.idl',
-      'filesystem/WorkerGlobalScopeFileSystem.idl',
       'gamepad/Gamepad.idl',
       'gamepad/GamepadList.idl',
-      'gamepad/NavigatorGamepad.idl',
       'geolocation/Coordinates.idl',
       'geolocation/Geolocation.idl',
       'geolocation/Geoposition.idl',
-      'geolocation/NavigatorGeolocation.idl',
       'geolocation/PositionCallback.idl',
       'geolocation/PositionError.idl',
       'geolocation/PositionErrorCallback.idl',
       'indexeddb/IDBAny.idl',
       'indexeddb/IDBCursor.idl',
       'indexeddb/IDBCursorWithValue.idl',
       'indexeddb/IDBDatabase.idl',
       'indexeddb/IDBFactory.idl',
       'indexeddb/IDBIndex.idl',
       'indexeddb/IDBKeyRange.idl',
       'indexeddb/IDBObjectStore.idl',
       'indexeddb/IDBOpenDBRequest.idl',
       'indexeddb/IDBRequest.idl',
       'indexeddb/IDBTransaction.idl',
       'indexeddb/IDBVersionChangeEvent.idl',
-      'indexeddb/WindowIndexedDatabase.idl',
-      'indexeddb/WorkerGlobalScopeIndexedDatabase.idl',
       'mediasource/MediaSource.idl',
       'mediasource/SourceBuffer.idl',
       'mediasource/SourceBufferList.idl',
       'mediasource/WebKitMediaSource.idl',
       'mediasource/WebKitSourceBuffer.idl',
       'mediasource/WebKitSourceBufferList.idl',
-      'mediasource/WindowMediaSource.idl',
       'mediastream/MediaStream.idl',
       'mediastream/MediaStreamEvent.idl',
       'mediastream/MediaStreamTrack.idl',
       'mediastream/MediaStreamTrackEvent.idl',
       'mediastream/MediaStreamTrackSourcesCallback.idl',
-      'mediastream/NavigatorMediaStream.idl',
       'mediastream/NavigatorUserMediaError.idl',
       'mediastream/NavigatorUserMediaErrorCallback.idl',
       'mediastream/NavigatorUserMediaSuccessCallback.idl',
       'mediastream/RTCDTMFSender.idl',
       'mediastream/RTCDTMFToneChangeEvent.idl',
       'mediastream/RTCDataChannel.idl',
       'mediastream/RTCDataChannelEvent.idl',
       'mediastream/RTCErrorCallback.idl',
       'mediastream/RTCIceCandidate.idl',
       'mediastream/RTCIceCandidateEvent.idl',
       'mediastream/RTCPeerConnection.idl',
       'mediastream/RTCSessionDescription.idl',
       'mediastream/RTCSessionDescriptionCallback.idl',
       'mediastream/RTCStatsCallback.idl',
       'mediastream/RTCStatsReport.idl',
       'mediastream/RTCStatsResponse.idl',
       'mediastream/SourceInfo.idl',
-      'navigatorcontentutils/NavigatorContentUtils.idl',
       'notifications/Notification.idl',
       'notifications/NotificationCenter.idl',
       'notifications/NotificationPermissionCallback.idl',
-      'notifications/WindowNotifications.idl',
-      'notifications/WorkerGlobalScopeNotifications.idl',
-      'performance/WorkerGlobalScopePerformance.idl',
       'performance/WorkerPerformance.idl',
-      'quota/NavigatorStorageQuota.idl',
       'quota/StorageErrorCallback.idl',
       'quota/StorageInfo.idl',
       'quota/StorageQuota.idl',
       'quota/StorageQuotaCallback.idl',
       'quota/StorageUsageCallback.idl',
-      'quota/WindowQuota.idl',
-      'quota/WorkerNavigatorStorageQuota.idl',
       'speech/SpeechGrammar.idl',
       'speech/SpeechGrammarList.idl',
       'speech/SpeechRecognition.idl',
       'speech/SpeechRecognitionAlternative.idl',
       'speech/SpeechRecognitionError.idl',
       'speech/SpeechRecognitionEvent.idl',
       'speech/SpeechRecognitionResult.idl',
       'speech/SpeechRecognitionResultList.idl',
       'speech/SpeechSynthesis.idl',
       'speech/SpeechSynthesisEvent.idl',
       'speech/SpeechSynthesisUtterance.idl',
       'speech/SpeechSynthesisVoice.idl',
-      'speech/WindowSpeechSynthesis.idl',
-      'vibration/NavigatorVibration.idl',
       'webaudio/AudioBuffer.idl',
       'webaudio/AudioBufferCallback.idl',
       'webaudio/AudioBufferSourceNode.idl',
       'webaudio/ChannelMergerNode.idl',
       'webaudio/ChannelSplitterNode.idl',
       'webaudio/AudioContext.idl',
       'webaudio/AudioDestinationNode.idl',
       'webaudio/GainNode.idl',
       'webaudio/AudioListener.idl',
       'webaudio/AudioNode.idl',
@@ skipping 21 matching lines @@
       'webdatabase/SQLError.idl',
       'webdatabase/SQLResultSet.idl',
       'webdatabase/SQLResultSetRowList.idl',
       'webdatabase/SQLStatementCallback.idl',
       'webdatabase/SQLStatementErrorCallback.idl',
       'webdatabase/SQLTransaction.idl',
       'webdatabase/SQLTransactionCallback.idl',
       'webdatabase/SQLTransactionErrorCallback.idl',
       'webdatabase/SQLTransactionSync.idl',
       'webdatabase/SQLTransactionSyncCallback.idl',
-      'webdatabase/WindowWebDatabase.idl',
-      'webdatabase/WorkerGlobalScopeWebDatabase.idl',
       'webmidi/MIDIAccess.idl',
       'webmidi/MIDIAccessPromise.idl',
       'webmidi/MIDIConnectionEvent.idl',
       'webmidi/MIDIErrorCallback.idl',
       'webmidi/MIDIInput.idl',
       'webmidi/MIDIMessageEvent.idl',
       'webmidi/MIDIOutput.idl',
       'webmidi/MIDIPort.idl',
       'webmidi/MIDISuccessCallback.idl',
-      'webmidi/NavigatorWebMIDI.idl',
       'websockets/CloseEvent.idl',
       'websockets/WebSocket.idl',
     ],
+    'python_modules_idl_files': [
+      'crypto/WindowCrypto.idl',
+      'crypto/WorkerGlobalScopeCrypto.idl',
+      'donottrack/NavigatorDoNotTrack.idl',
+      'filesystem/DataTransferItemFileSystem.idl',
+      'filesystem/HTMLInputElementFileSystem.idl',
+      'filesystem/WindowFileSystem.idl',
+      'filesystem/WorkerGlobalScopeFileSystem.idl',
+      'gamepad/NavigatorGamepad.idl',
+      'geolocation/NavigatorGeolocation.idl',
+      'indexeddb/WindowIndexedDatabase.idl',
+      'indexeddb/WorkerGlobalScopeIndexedDatabase.idl',
+      'mediasource/WindowMediaSource.idl',
+      'mediastream/NavigatorMediaStream.idl',
+      'navigatorcontentutils/NavigatorContentUtils.idl',
+      'notifications/WindowNotifications.idl',
+      'notifications/WorkerGlobalScopeNotifications.idl',
+      'performance/WorkerGlobalScopePerformance.idl',
+      'quota/NavigatorStorageQuota.idl',
+      'quota/WindowQuota.idl',
+      'quota/WorkerNavigatorStorageQuota.idl',
+      'speech/WindowSpeechSynthesis.idl',
+      'vibration/NavigatorVibration.idl',
+      'webdatabase/WindowWebDatabase.idl',
+      'webdatabase/WorkerGlobalScopeWebDatabase.idl',
+      'webmidi/NavigatorWebMIDI.idl',
+    ],
     'modules_files': [
       '<@(extra_blink_module_files)',
       'crypto/AesCbcParams.cpp',
       'crypto/AesCbcParams.h',
       'crypto/AesKeyGenParams.cpp',
       'crypto/AesKeyGenParams.h',
       'crypto/Algorithm.cpp',
       'crypto/Algorithm.h',
       'crypto/Crypto.cpp',
       'crypto/Crypto.h',
@@ skipping 502 matching lines @@
       'websockets/WorkerThreadableWebSocketChannel.h',
     ],
     'modules_unittest_files': [
       'websockets/WebSocketDeflaterTest.cpp',
       'websockets/WebSocketExtensionDispatcherTest.cpp',
       'websockets/WebSocketExtensionParserTest.cpp',
       'websockets/WebSocketPerMessageDeflateTest.cpp',
     ],
   },
 }