Add android_optional_gpu_tests_rel to master.tryserver.chromium.android.

scripts/slave/recipe_modules/chromium_tests/trybots.py

 # Copyright 2015 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.
 
 from recipe_engine.types import freeze
 
 
 def simple_bot(bot_id, analyze_mode=None):
   return {
     'bot_ids': [bot_id],
@@ skipping 97 matching lines @@
         'buildername': 'Android Coverage (dbg)'
       }),
       'android_swarming_rel': simple_bot({
         'mastername': 'chromium.android',
         'buildername': 'Android Swarm Builder',
       }),
       'android_n5x_swarming_rel': simple_bot({
         'mastername': 'chromium.android',
         'buildername': 'Android N5X Swarm Builder',
       }),
+      'android_optional_gpu_tests_rel': simple_bot({
+        'mastername': 'chromium.gpu.fyi',
+        'buildername': 'Android Release (Nexus 5X)',
+      }),
       'cast_shell_android': simple_bot({
         'mastername': 'chromium.linux',
         'buildername': 'Cast Android (dbg)',
       }),
       'linux_android_dbg_ng': simple_bot({
         'mastername': 'chromium.linux',
         'buildername': 'Android Builder (dbg)',
         'tester': 'Android Tests (dbg)',
       }),
       'linux_android_rel_ng': simple_bot({
@@ skipping 450 matching lines @@
         'mastername': 'client.v8.fyi',
         'buildername': 'V8 Linux GN',
       }),
       'v8_android_chromium_gn_dbg': simple_bot({
         'mastername': 'client.v8.fyi',
         'buildername': 'V8 Android GN (dbg)',
       }),
     },
   },
 })