Programmatically upload to Google Photos with XMP Title

Extract the XMP title using exiftools and then add it to the uploaded item.

This change adds an ImageTitle entry to the uploadedItem struct.  It then fills
it using an exiftools wrapper and the info is uploaded to google photos via
the API with the AlbumID and UploadToken.

Note, this ignores any batching and will only work with single thread uploads (`--transfers 1`)

backend/googlephotos/googlephotos.go

@@ -36,6 +36,8 @@ import (
 	"github.com/rclone/rclone/lib/rest"
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
+
+	"github.com/barasher/go-exiftool"
 )
 
 var (
@@ -992,6 +994,7 @@ func (o *Object) Open(ctx context.Context, options ...fs.OpenOption) (in io.Read
 // input to the batcher
 type uploadedItem struct {
 	AlbumID     string // desired album
+	ImageTitle  string // Title taken from the EXIF XMP Title
 	UploadToken string // upload ID
 }
 
@@ -1009,6 +1012,7 @@ func (f *Fs) commitBatchAlbumID(ctx context.Context, items []uploadedItem, resul
 	for i := range items {
 		if items[i].AlbumID == albumID {
 			request.NewMediaItems = append(request.NewMediaItems, api.NewMediaItem{
+	            Description: items[i].ImageTitle,
 				SimpleMediaItem: api.SimpleMediaItem{
 					UploadToken: items[i].UploadToken,
 				},
@@ -1125,8 +1129,13 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
 		return errors.New("empty upload token")
 	}
 
+	et, err := exiftool.NewExiftool()
+	fileInfos := et.ExtractMetadata(fileName)
+	exifTitle, err := fileInfos[0].GetString("Title")
+
 	uploaded := uploadedItem{
 		AlbumID:     albumID,
+		ImageTitle:  exifTitle,
 		UploadToken: uploadToken,
 	}