Add libyuv_unittest_apk target to run tests on Android

util/android/test_runner.py

+#!/usr/bin/env python
+# Copyright 2014 The LibYuv Project Authors. All rights reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS. All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+"""
+Runs tests on Android devices.
+
+This script exists to avoid Libyuv being broken by changes in the Chrome Android
+test execution toolchain. It also conveniently sets the CHECKOUT_SOURCE_ROOT
+environment variable.
+"""
+
+import os
+import sys
+
+SCRIPT_DIR = os.path.dirname(__file__)
+ROOT_DIR = os.path.abspath(os.path.join(SCRIPT_DIR, os.pardir, os.pardir))
+CHROMIUM_BUILD_ANDROID_DIR = os.path.join(ROOT_DIR, 'build', 'android')
+sys.path.insert(0, CHROMIUM_BUILD_ANDROID_DIR)
+
+
+import test_runner  # pylint: disable=W0406
+
+def main():
+  # Override environment variable to make it possible for the scripts to find
+  # the root directory (our symlinking of the Chromium build toolchain would
+  # otherwise make them fail to do so).
+  os.environ['CHECKOUT_SOURCE_ROOT'] = ROOT_DIR
+  return test_runner.main()
+
+if __name__ == '__main__':
+  sys.exit(main())