(For-try) Divide recursive Copy/Move into multiple async tasks

webkit/fileapi/obfuscated_file_util.h

Index: webkit/fileapi/obfuscated_file_util.h
diff --git a/webkit/fileapi/obfuscated_file_util.h b/webkit/fileapi/obfuscated_file_util.h
index 039936a59edd72acea6be26af546d80ba54b1674..771f7ce66af80c0d64d9527fceda346c47c4ec22 100644
--- a/webkit/fileapi/obfuscated_file_util.h
+++ b/webkit/fileapi/obfuscated_file_util.h
@@ -98,9 +98,6 @@ class WEBKIT_STORAGE_EXPORT_PRIVATE ObfuscatedFileUtil
       FileSystemOperationContext* context,
       const FileSystemURL& url,
       int64 length) OVERRIDE;
-  virtual bool IsDirectoryEmpty(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url) OVERRIDE;
   virtual base::PlatformFileError CopyOrMoveFile(
       FileSystemOperationContext* context,
       const FileSystemURL& src_url,
@@ -113,7 +110,7 @@ class WEBKIT_STORAGE_EXPORT_PRIVATE ObfuscatedFileUtil
   virtual base::PlatformFileError DeleteFile(
       FileSystemOperationContext* context,
       const FileSystemURL& url) OVERRIDE;
-  virtual base::PlatformFileError DeleteSingleDirectory(
+  virtual base::PlatformFileError DeleteDirectory(
       FileSystemOperationContext* context,
       const FileSystemURL& url) OVERRIDE;
   virtual base::PlatformFileError CreateSnapshotFile(
@@ -123,6 +120,11 @@ class WEBKIT_STORAGE_EXPORT_PRIVATE ObfuscatedFileUtil
       FilePath* platform_path,
       SnapshotFilePolicy* policy) OVERRIDE;
 
+  // Returns true if the directory |url| is empty.
+  bool IsDirectoryEmpty(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url);
+
   // Gets the topmost directory specific to this origin and type.  This will
   // contain both the directory database's files and all the backing file
   // subdirectories.