Adding latency_unittests to run on trybots.

testing/buildbot/chromium.android.fyi.json

 {
   "Android Tests (trial)(dbg)": {
     "gtest_tests": [
       {
         "swarming": {
           "can_use_on_swarming_builders": false
         },
         "test": "blink_heap_unittests"
       },
       {
@@ skipping 60 matching lines @@
       {
         "test": "gpu_ipc_service_unittests"
       },
       {
         "test": "gpu_unittests"
       },
       {
         "test": "ipc_tests"
       },
       {
+        "test": "latency_unittests"
+      },
+      {
         "test": "media_unittests"
       },
       {
         "test": "net_unittests"
       },
       {
         "override_compile_targets": [
           "sandbox_linux_unittests_deps"
         ],
         "test": "sandbox_linux_unittests"
@@ skipping 79 matching lines @@
       {
         "test": "gpu_ipc_service_unittests"
       },
       {
         "test": "gpu_unittests"
       },
       {
         "test": "ipc_tests"
       },
       {
+        "test": "latency_unittests"
+      },
+      {
         "test": "media_unittests"
       },
       {
         "test": "net_unittests"
       },
       {
         "override_compile_targets": [
           "sandbox_linux_unittests_deps"
         ],
         "test": "sandbox_linux_unittests"
@@ skipping 358 matching lines @@
               "android_devices": "1",
               "device_os": "LMY47W",
               "device_type": "sprout"
             }
           ],
           "expiration": 14400
         },
         "test": "ipc_tests"
       },
       {
+        "override_isolate_target": "latency_unittests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "android_devices": "1",
+              "device_os": "LMY47W",
+              "device_type": "sprout"
+            }
+          ],
+          "expiration": 14400
+        },
+        "test": "latency_unittests"
+      },
+      {
         "override_isolate_target": "media_unittests",
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "android_devices": "1",
               "device_os": "LMY47W",
               "device_type": "sprout"
             }
           ],
@@ skipping 2741 matching lines @@
               "device_type": "gce_x86"
             }
           ],
           "hard_timeout": 960,
           "shards": 1
         }
       }
     ]
   }
 }