Mount MTP devices in Chrome OS Files.app.

webkit/common/fileapi/file_system_types.h

Index: webkit/common/fileapi/file_system_types.h
diff --git a/webkit/common/fileapi/file_system_types.h b/webkit/common/fileapi/file_system_types.h
index c24d8d3b410a739583ebd7ed2874b2addb676e56..409f3dcb49d7ad678efa52894e5ba69adb4d06da 100644
--- a/webkit/common/fileapi/file_system_types.h
+++ b/webkit/common/fileapi/file_system_types.h
@@ -122,6 +122,10 @@ enum FileSystemType {
   // A filesystem that is mounted via the FileSystemProvider API.
   kFileSystemTypeProvided,
 
+  // A media filesystem such as MTP or PTP, mounted as a file storage not
+  // limited to media files.
+  kFileSystemTypeDeviceMediaAsFileStorage,
+
   // --------------------------------------------------------------------
   // Marks the end of internal type enum. (This is not the actual fs type)
   // New internal filesystem types must be added above this line.