Add a component updater for the CLD2 data file.

chrome/browser/component_updater/cld_component_installer.h

+// 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 CHROME_BROWSER_COMPONENT_UPDATER_CLD_COMPONENT_INSTALLER_H_
+#define CHROME_BROWSER_COMPONENT_UPDATER_CLD_COMPONENT_INSTALLER_H_
+
+#include "base/files/file_path.h"
+
+namespace component_updater {
+
+class ComponentUpdateService;
+
+void RegisterCldComponent(ComponentUpdateService* cus);
+
+// Places the path to the latest CLD data file into the specified path object.
+// Returns true if and only if the file has been observed to exist at least
+// once and was valid when it was observed; if the method returns false, the

[Sorin Jianu, 2014/04/25 16:39:41]

Small terminology neat. This is a function not a method. In C++, virtual
functions are sometimes called methods. People are somewhat loose with the
terminology and they extend the word method to cover any member functions. Few
would call a standalone function a method.

[Andrew Hayden (chromium.org), 2014/04/25 17:07:21]

Done. Sorry, my C++ terminology has atrophied. Getting it back, one nit at a
time :)

+// path parameter is not modified. This method is completely threadsafe.

[Sorin Jianu, 2014/04/25 16:39:41]

I think we could simply say: "The function is thread-safe".

[Andrew Hayden (chromium.org), 2014/04/25 17:07:21]

Done.

+bool GetLatestCldDataFile(base::FilePath* path);
+
+}  // namespace component_updater
+
+#endif  // CHROME_BROWSER_COMPONENT_UPDATER_CLD_COMPONENT_INSTALLER_H_