Link VPX into GN build more.

content/test/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("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 content_tests_gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("../content_tests.gypi"),
@@ skipping 99 matching lines @@
 
     if (use_aura || is_mac) {
       deps += [ "//ui/compositor" ]
     }
 
     if (is_win) {
       deps += [ "//third_party/iaccessible2" ]
     }
 
     if (!is_android && !is_ios) {
-      #deps += [ "//third_party/libvpx" ]  TODO(GYP)
+      deps += [ "//third_party/libvpx" ]
     }
 
     if (is_android) {
       deps += [ "//ui/shell_dialogs" ]
     }
 
     if (is_win) {
       deps += [ "//sandbox" ]
     }
   } else { # is_ios
@@ skipping 41 matching lines @@
 
     generate_jni("jni") {
       sources = [ "../public/test/android/javatests/src/org/chromium/content/browser/test/NestedSystemMessageHandler.java" ]
       jni_package = "content/public/test"
     }
   }
 }  # !is_ios
 
 # TODO(GYP): Unit test targets