[Android] JUnit runner + gyp changes.

testing/android/junit_test.gyp

+# Copyright (c) 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'junit_test_support',
+      'type': 'none',
+      'dependencies': [
+        '../../third_party/junit/junit.gyp:junit_jar',
+      ],
+      'variables': {
+        'src_paths': [ '../../testing/android/java' ],
+        'excluded_src_paths': [
+          '../../testing/android/java/src/org/chromium/native_test'
+        ],
+      },
+      'all_dependent_settings': {
+        'variables': {
+          'main_class': 'org.chromium.testing.local.JunitTestMain',
+        },
+      },
+      'includes': [
+        '../../build/host_jar.gypi',
+      ],
+    },
+  ]
+}