Rust: Add encoder/decoder tests

mojo/public/rust/build.rs

 // Copyright 2016 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.
 
 //! This build.rs generates some parameters for Cargo which are necessary to build.
 //! Particularly, it searches for libsystem_thunks.a.
 
 use std::env;
 use std::ffi::OsStr;
 use std::fs;
@@ skipping 38 matching lines @@
     if mojo_out_dir.is_dir() {
         if !embed {
             match search_output(mojo_out_dir, OsStr::new("libsystem_thunks.a")) {
                 Some(path) => {
                     println!("cargo:rustc-link-lib=static=system_thunks");
                     println!("cargo:rustc-link-search=native={}", path.display());
                 }
                 None => panic!("Failed to find system_thunks."),
             }
         } else {
+            println!("cargo:rustc-link-lib=stdc++");
+            match search_output(mojo_out_dir, OsStr::new("libvalidation_parser.a")) {
+                Some(path) => {
+                    println!("cargo:rustc-link-lib=static=validation_parser");
+                    println!("cargo:rustc-link-search=native={}", path.display());
+                }
+                None => panic!("Failed to find validation_parser."),
+            }
             match search_output(mojo_out_dir, OsStr::new("librust_embedder.a")) {
                 Some(path) => {
-                    println!("cargo:rustc-link-lib=stdc++");
                     println!("cargo:rustc-link-lib=static=rust_embedder");
                     println!("cargo:rustc-link-search=native={}", path.display());
                 }
                 None => panic!("Failed to find rust_embedder."),
             }
         }
     } else {
         panic!("MOJO_OUT_DIR is not a valid directory.");
     }
 }