Implement more of chrome.serial on the Mojo SerialConnection.

extensions/BUILD.gn

 # 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.
 
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 
 # GYP version: extensions/extensions_resources.gyp:extensions_resources
 group("extensions_resources") {
   deps = [
@@ skipping 148 matching lines @@
   ]
 
   deps = [
     ":extensions_resources",
     ":shell_and_test_pak",
     ":test_support",
     "//base",
     "//base/test:test_support",
     "//content/test:test_support",
     "//device/serial",
+    "//device/serial:test_util",
     "//extensions/common",
     "//extensions/renderer",
     "//extensions/strings",
     "//mojo/environment:chromium",
     "//mojo/public/cpp/bindings",
     "//mojo/bindings/js",
     "//mojo/system",
     "//testing/gmock",
     "//testing/gtest",
   ]
 
   if (is_win) {
     deps += [
       "//base/allocator",
     ]
   }
 }
 }