Files.app: Enable externalfile: protocol for MTP volumes.

storage/browser/fileapi/file_system_url.h

Index: storage/browser/fileapi/file_system_url.h
diff --git a/storage/browser/fileapi/file_system_url.h b/storage/browser/fileapi/file_system_url.h
index 7b0e97d4300eca5c69ef8e4bec365d629226c1b5..aca3cc00353d64d936547730f64aa365ee7b7769 100644
--- a/storage/browser/fileapi/file_system_url.h
+++ b/storage/browser/fileapi/file_system_url.h
@@ -86,6 +86,14 @@ class STORAGE_EXPORT FileSystemURL {
   static FileSystemURL CreateForTest(const GURL& origin,
                                      FileSystemType mount_type,
                                      const base::FilePath& virtual_path);
+  static FileSystemURL CreateForTest(const GURL& origin,
+                                     FileSystemType mount_type,
+                                     const base::FilePath& virtual_path,
+                                     const std::string& mount_filesystem_id,
+                                     FileSystemType cracked_type,
+                                     const base::FilePath& cracked_path,
+                                     const std::string& filesystem_id,
+                                     const FileSystemMountOption& mount_option);
 
   // Returns true if this instance represents a valid FileSystem URL.
   bool is_valid() const { return is_valid_; }