add expected durations to operation

src/operations/video_upload.gql

@@ -1,5 +1,11 @@
-mutation CreateUploadStream($videoMetadataInput: VideoMetadataInput!) {
-  createUploadStream(videoMetadata: $videoMetadataInput) {
+mutation CreateUploadStream(
+  $videoMetadataInput: VideoMetadataInput!
+  $expectedDurationSeconds: Float = null
+) {
+  createUploadStream(
+    videoMetadata: $videoMetadataInput
+    expectedDurationSeconds: $expectedDurationSeconds
+  ) {
     videoId
   }
 }