[FileSystem] Add another copy-or-move validation hook for post-write.

webkit/browser/fileapi/copy_or_move_file_validator.h

Index: webkit/browser/fileapi/copy_or_move_file_validator.h
diff --git a/webkit/browser/fileapi/copy_or_move_file_validator.h b/webkit/browser/fileapi/copy_or_move_file_validator.h
index 9b32f5b8d3b101f81caae0d29038d76fb6ebd289..52cf0bf9b3445e749899d2cc75507ff6be311c65 100644
--- a/webkit/browser/fileapi/copy_or_move_file_validator.h
+++ b/webkit/browser/fileapi/copy_or_move_file_validator.h
@@ -13,6 +13,10 @@ namespace base {
 class FilePath;
 }
 
+namespace webkit_blob {
+class ShareableFileReference;
+}
+
 namespace fileapi {
 
 class FileSystemURL;
@@ -25,7 +29,20 @@ class WEBKIT_STORAGE_BROWSER_EXPORT CopyOrMoveFileValidator {
 
   virtual ~CopyOrMoveFileValidator() {}
 
+  // Called on a source file before copying or moving to the final
+  // destination.
   virtual void StartValidation(const ResultCallback& result_callback) = 0;
+
+  // Called on a destination file after copying or moving to the final
+  // destination. Suitable for running Anti-Virus checks. The |file_ref| is
+  // a refcounted keepalive token for the destination file which may or
+  // may not be present. Implementations should maintain the |file_ref| until
+  // they finish and return in order to make sure the file is not prematurely
+  // deleted from under them.
+  virtual void StartPostWriteValidation(
+      const base::FilePath& dest_platform_path,
+      scoped_refptr<webkit_blob::ShareableFileReference> file_ref,
+      const ResultCallback& result_callback) = 0;
 };
 
 class CopyOrMoveFileValidatorFactory {