MediaRecorder: Adding BlobEvent and connecting it in MediaRecorderHandler

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 87 matching lines @@
       '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',
+      'mediarecorder/BlobEvent.idl',
       'mediarecorder/MediaRecorder.idl',
       'mediarecorder/MediaRecorderErrorEvent.idl',
       'mediasession/MediaSession.idl',
       'mediasource/MediaSource.idl',
       'mediasource/SourceBuffer.idl',
       'mediasource/SourceBufferList.idl',
       'mediasource/TrackDefault.idl',
       'mediasource/TrackDefaultList.idl',
       'mediasource/VideoPlaybackQuality.idl',
       'mediastream/MediaDeviceInfo.idl',
@@ skipping 270 matching lines @@
       'background_sync/PeriodicSyncEvent.idl',
       'background_sync/SyncEvent.idl',
       'device_light/DeviceLightEvent.idl',
       'device_orientation/DeviceMotionEvent.idl',
       'device_orientation/DeviceOrientationEvent.idl',
       'encryptedmedia/MediaEncryptedEvent.idl',
       'encryptedmedia/MediaKeyMessageEvent.idl',
       'gamepad/GamepadEvent.idl',
       'geofencing/GeofencingEvent.idl',
       'indexeddb/IDBVersionChangeEvent.idl',
+      'mediarecorder/BlobEvent.idl',
       'mediarecorder/MediaRecorderErrorEvent.idl',
       'mediastream/MediaStreamEvent.idl',
       'mediastream/MediaStreamTrackEvent.idl',
       'mediastream/RTCDTMFToneChangeEvent.idl',
       'mediastream/RTCDataChannelEvent.idl',
       'mediastream/RTCIceCandidateEvent.idl',
       'navigatorconnect/ServicePortConnectEvent.idl',
       'notifications/NotificationEvent.idl',
       'presentation/PresentationSessionConnectEvent.idl',
       'push_messaging/PushEvent.idl',
@@ skipping 671 matching lines @@
       'indexeddb/IndexedDBClient.cpp',
       'indexeddb/IndexedDBClient.h',
       'indexeddb/InspectorIndexedDBAgent.cpp',
       'indexeddb/InspectorIndexedDBAgent.h',
       'indexeddb/WebIDBCallbacksImpl.cpp',
       'indexeddb/WebIDBCallbacksImpl.h',
       'indexeddb/WebIDBDatabaseCallbacksImpl.cpp',
       'indexeddb/WebIDBDatabaseCallbacksImpl.h',
       'indexeddb/WorkerGlobalScopeIndexedDatabase.cpp',
       'indexeddb/WorkerGlobalScopeIndexedDatabase.h',
+      'mediarecorder/BlobEvent.cpp',
+      'mediarecorder/BlobEvent.h',
       'mediarecorder/MediaRecorder.cpp',
       'mediarecorder/MediaRecorder.h',
       'mediarecorder/MediaRecorderErrorEvent.cpp',
       'mediarecorder/MediaRecorderErrorEvent.h',
       'mediasession/HTMLMediaElementMediaSession.cpp',
       'mediasession/HTMLMediaElementMediaSession.h',
       'mediasession/MediaSession.cpp',
       'mediasession/MediaSession.h',
       'mediasource/HTMLVideoElementMediaSource.cpp',
       'mediasource/HTMLVideoElementMediaSource.h',
@@ skipping 721 matching lines @@
       'webaudio/AudioBasicProcessorHandlerTest.cpp',
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }