Add android_optional_gpu_tests_rel to variuos presubmit scripts

gpu/PRESUBMIT.py

 # Copyright (c) 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.
 
 """Top-level presubmit script for gpu.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into depot_tools.
 """
 
 def PostUploadHook(cl, change, output_api):
   """git cl upload will call this hook after the issue is created/modified.
 
   This hook modifies the CL description in order to run extra GPU
   tests (in particular, the WebGL 2.0 conformance tests) in addition
   to the regular CQ try bots. This test suite is too large to run
   against all Chromium commits, but should be run against changes
   likely to affect these tests.
   """
   return output_api.EnsureCQIncludeTrybotsAreAdded(
     cl,
     [
       'master.tryserver.chromium.linux:linux_optional_gpu_tests_rel',
       'master.tryserver.chromium.mac:mac_optional_gpu_tests_rel',
       'master.tryserver.chromium.win:win_optional_gpu_tests_rel',
+      'master.tryserver.chromium.android:android_optional_gpu_tests_rel',
     ],
     'Automatically added optional GPU tests to run on CQ.')