Unpack extensions inside chrome's directory.

base/scoped_temp_dir.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_SCOPED_TEMP_DIR_H_
 #define BASE_SCOPED_TEMP_DIR_H_
 
 // An object representing a temporary / scratch directory that should be cleaned
 // up (recursively) when this object goes out of scope.  Note that since
 // deletion occurs during the destructor, no further error handling is possible
 // if the directory fails to be deleted.  As a result, deletion is not
 // guaranteed by this class.
 
 #include "base/file_path.h"
 
 class ScopedTempDir {
  public:
   // No directory is owned/created initially.
   ScopedTempDir();
 
   // Recursively delete path_
   ~ScopedTempDir();
 
   // Creates a unique directory in TempPath, and takes ownership of it.
   // See file_util::CreateNewTemporaryDirectory.
   bool CreateUniqueTempDir();
 
+  // Creates a unique directory under a given path, and takes ownership of it.
+  bool CreateUniqueTempDirUnderPath(const FilePath& path);
+
   // Takes ownership of directory at |path|, creating it if necessary.
   // Don't call multiple times unless Take() has been called first.
   bool Set(const FilePath& path);
 
   // Caller takes ownership of the temporary directory so it won't be destroyed
   // when this object goes out of scope.
   FilePath Take();
 
   const FilePath& path() const { return path_; }
 
   // Returns true if path_ is non-empty and exists.
   bool IsValid() const;
 
  private:
   FilePath path_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedTempDir);
 };
 
 #endif  // BASE_SCOPED_TEMP_DIR_H_