Add Java function to retrieve the native library dir.

base/android/path_utils.cc

Index: base/android/path_utils.cc
diff --git a/base/android/path_utils.cc b/base/android/path_utils.cc
index c46e6693aaff9590e2d5422c56589ca8fcbd9ef2..cf5542af681eddd5b0673301be35c95474729e17 100644
--- a/base/android/path_utils.cc
+++ b/base/android/path_utils.cc
@@ -34,6 +34,13 @@ std::string GetDownloadsDirectory() {
   return ConvertJavaStringToUTF8(path);
 }
 
+std::string GetNativeLibraryDirectory() {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jstring> path =
+      Java_PathUtils_getNativeLibraryDirectory(env, GetApplicationContext());
+  return ConvertJavaStringToUTF8(path);
+}
+
 bool RegisterPathUtils(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }