Add PathUtilsTest.

base/android/path_utils.h

 // Copyright (c) 2011 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_ANDROID_PATH_UTILS_H_
 #define BASE_ANDROID_PATH_UTILS_H_
 
 #include <jni.h>
 #include <string>
 
 namespace base {
 namespace android {
 
 // Return the absolute path to the data directory of the current application.
 // This method is dedicated for base_paths_android.c, Using
 // PathService::Get(base::DIR_ANDROID_APP_DATA, ...) gets the data dir.
 std::string GetDataDirectory();
 
 // Return the absolute path to the cache directory. This method is dedicated for
 // base_paths_android.c, Using PathService::Get(base::DIR_CACHE, ...) gets the
 // cache dir.
 std::string GetCacheDirectory();
 
+// Returns the path to the public downloads directory.
+std::string GetDownloadsDirectory();
+
 bool RegisterPathUtils(JNIEnv* env);
 
 }  // namespace android
 }  // namespace base
 
 #endif  // BASE_ANDROID_PATH_UTILS_H_