Add DIR_ANDROID_EXTERNAL_STORAGE to base/base_path.h

base/android/path_utils.h

 // Copyright (c) 2012 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>
 
@@ skipping 10 matching lines @@
 // cache dir.
 std::string GetCacheDirectory();
 
 // Returns the path to the public downloads directory.
 std::string GetDownloadsDirectory();
 
 // Returns the path to the native JNI libraries via
 // ApplicationInfo.nativeLibraryDir on the Java side.
 std::string GetNativeLibraryDirectory();
 
+// Returns the absolute path to the external storage directory.
+std::string GetExternalStorageDirectory();
+
 bool RegisterPathUtils(JNIEnv* env);
 
 }  // namespace android
 }  // namespace base
 
 #endif  // BASE_ANDROID_PATH_UTILS_H_