Add android_optional_gpu_tests_rel to master.tryserver.chromium.android.

masters/master.tryserver.chromium.android/builders.pyl

 {
   "master_base_class": "Master4a",
   "master_port": 21401,
   "master_port_alt": 41401,
   "slave_port": 31401,
   "templates": ["templates", "../master.chromium/templates"],
 
   "service_account_file": "service-account-chromium-tryserver.json",
   "buildbucket_bucket": "master.tryserver.chromium.android",
 
@@ skipping 152 matching lines @@
       "slavebuilddir": "android_chromium_variable_nexus4",
       "slave_pools": ["slaves_with_nexus4_devices"],
     },
     "android_chromium_variable_archive": {
       "builder_timeout_s": 36000,  # 60 * 600
       "recipe": "findit/chromium/compile",
       "scheduler": None,
       "slavebuilddir": "android_chromium_variable_archive",
       "slave_pools": ["ccompute_optional_bots"],
     },
+    "android_optional_gpu_tests_rel": {
+      "builder_timeout_s": 6900,  # 60 * 115
+      "recipe": "chromium_trybot",
+      "scheduler": None,
+      "slavebuilddir": "android",
+      "slave_pools": ["ccompute_android_launch"],
+    },
   },
 
   "schedulers": { },
 
   "slave_pools": {
     "ccompute_android_launch": {
       "slave_data": {
         "os": "linux",
         "version": "trusty",
         "bits": 64,
@@ skipping 263 matching lines @@
         "os": "linux",
         "version": "precise",
         "bits": 64,
       },
       "slaves": [
         "build35-b4",
       ],
     }
   }
 }