Add convert_web_app.*, a utility to convert web apps declared

chrome/browser/extensions/convert_web_app.h

Index: chrome/browser/extensions/convert_web_app.h
diff --git a/chrome/browser/extensions/convert_web_app.h b/chrome/browser/extensions/convert_web_app.h
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+++ b/chrome/browser/extensions/convert_web_app.h
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+// Copyright (c) 2010 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 CHROME_BROWSER_EXTENSIONS_CONVERT_WEB_APP_H_
+#define CHROME_BROWSER_EXTENSIONS_CONVERT_WEB_APP_H_
+#pragma once
+
+#include <string>
+
+#include "base/ref_counted.h"
+
+class Extension;
+
+namespace base {
+class Time;
+}
+
+namespace webkit_glue {
+class WebApplicationInfo;
+}
+
+// Generates a version number for an extension from a time. The goal is to make
+// use of the version number to communicate some useful information. The
+// returned version has the format:
+// <year>.<month><day>.<upper 16 bits of unix timestamp>.<lower 16 bits>
+std::string ConvertTimeToExtensionVersion(const base::Time& time);
+
+// Wraps the specified web app in an extension. The extension is created
+// unpacked in the system temp dir. Returns a valid extension that the caller
+// should take ownership on success, or NULL and |error| on failure.
+//
+// NOTE: This function does file IO and should not be called on the UI thread.
+// NOTE: The caller takes ownership of the directory at extension->path() on the
+// returned object.
+scoped_refptr<Extension> ConvertWebAppToExtension(
+    const webkit_glue::WebApplicationInfo& web_app_info,
+    const base::Time& create_time);
+
+#endif  // CHROME_BROWSER_EXTENSIONS_CONVERT_WEB_APP_H_