Add mojo package manager skeleton.

mojo/tools/package_manager/unpacker.h

Index: mojo/tools/package_manager/unpacker.h
diff --git a/mojo/tools/package_manager/unpacker.h b/mojo/tools/package_manager/unpacker.h
new file mode 100644
index 0000000000000000000000000000000000000000..2f7acc590f8d1debd85847750bf4f2600356ed88
--- /dev/null
+++ b/mojo/tools/package_manager/unpacker.h
@@ -0,0 +1,40 @@
+// Copyright 2014 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 MOJO_TOOLS_PACKAGE_MANAGER_UNPACKER_H_
+#define MOJO_TOOLS_PACKAGE_MANAGER_UNPACKER_H_
+
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "mojo/public/cpp/system/macros.h"
+
+namespace mojo {
+
+// Unzips a package into a temporary folder. The temporary folder will be
+// deleted when the object is destroyed.
+//
+// In the future, this class would probably manage doing the unzip operation on
+// a background thread.
+class Unpacker {
+ public:
+  Unpacker();
+  ~Unpacker();
+
+  // Actually does the unpacking, returns true on success.
+  bool Unpack(const base::FilePath& zip_file);
+
+  // The root directory where the package has been unpacked.
+  const base::FilePath& dir() const { return dir_; }
+
+ private:
+  base::FilePath zip_file_;
+
+  base::FilePath dir_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(Unpacker);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_TOOLS_PACKAGE_MANAGER_UNPACKER_H_