Componentize component_updater: Move some paths/constants to component.

components/component_updater/common/component_updater_paths.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 COMPONENTS_COMPONENT_UPDATER_COMMON_COMPONENT_UPDATER_PATHS_H_
+#define COMPONENTS_COMPONENT_UPDATER_COMMON_COMPONENT_UPDATER_PATHS_H_
+
+#include "base/files/file_path.h"
+
+namespace component_updater {
+
+enum {
+  PATH_START = 10000,

[Sorin Jianu, 2014/06/30 22:27:53]

How did we come up with this hard-coded value here?

[tommycli, 2014/07/01 00:03:04]

PATH_START must be different for each PathProvider.

The previous highest one was 9000, and they increment by 1000 each time.

See:
https://code.google.com/p/chromium/codesearch#search/&q=%22PATH_START%20=%22&...

+  DIR_COMPONENT_CLD2 = PATH_START,  // Directory that contains component-updated
+                                    // Compact Language Detector files.
+  DIR_RECOVERY_BASE,                // Full path to the dir for Recovery
+                                    // component.
+  DIR_SWIFT_SHADER,                 // Path to the SwiftShader component.
+  PATH_END
+};
+
+// Call once to register the provider for the path keys defined above.
+// |components_root_key| is the path provider key defining where the
+// components should be installed.
+void RegisterPathProvider(const base::FilePath& components_root_key);
+
+}  // namespace component_updater
+
+#endif  // COMPONENTS_COMPONENT_UPDATER_COMMON_COMPONENT_UPDATER_PATHS_H_