fix: add missed enum SaveRequestType to PdfViewerPrivate function (#48404)

fix: add missed SaveRequestType enum to PdfViewerPrivate function

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Bill Shen <15865969+cucbin@users.noreply.github.com>

shell/common/extensions/api/pdf_viewer_private.idl

@@ -6,6 +6,15 @@
 // functionality that the PDF Viewer needs from outside the PDF plugin. This API
 // is exclusively for the PDF Viewer.
 namespace pdfViewerPrivate {
+  // Must match `SaveRequestType` in `pdf/mojom/pdf.mojom` and
+  // `tools/typescript/definitions/pdf_viewer_private.d.ts`.
+  enum SaveRequestType {
+    ANNOTATION,
+    ORIGINAL,
+    EDITED,
+    SEARCHIFIED
+  };
+
   // Nearly identical to mimeHandlerPrivate.StreamInfo, but without a mime type
   // nor a response header field. Those fields are unused by the PDF viewer.
   dictionary StreamInfo {
@@ -52,6 +61,13 @@ namespace pdfViewerPrivate {
         DOMString url,
         IsAllowedLocalFileAccessCallback callback);
 
+    // Sends a request to save the PDF to Google Drive if `saveRequestType` is
+    // set. Otherwise, if `saveRequestType` is not set, the default action is
+    // to cancel the existing upload.
+    static void saveToDrive(
+        optional SaveRequestType saveRequestType,
+        optional VoidCallback callback);
+
     // Sets the current tab title to `title` for a full-page PDF.
     static void setPdfDocumentTitle(
         DOMString title,