Enable telemetry_unittests on chromium.android:Marshmallow 64-bit Tester

testing/buildbot/chromium.android.json

 {
   "Android Cronet Builder": {
     "additional_compile_targets": [
       "cronet_package"
     ]
   },
   "Android N5X Swarm Builder": {
     "gtest_tests": [
       {
         "override_compile_targets": [
@@ skipping 3789 matching lines @@
                 "https://luci-logdog.appspot.com/v/?s",
                 "=android%2Fswarming%2Flogcats%2F",
                 "${TASK_ID}%2F%2B%2Funified_logcats"
               ],
               "name": "shard #${SHARD_INDEX} logcats"
             }
           ]
         },
         "test": "vr_shell_unittests"
       }
+    ],
+    "isolated_scripts": [
+      {
+        "args": [
+          "--browser=android-chromium",
+          "--device=android"
+        ],
+        "isolate_name": "telemetry_unittests",
+        "name": "telemetry_unittests",
+        "override_compile_targets": [

[jbudorick, 2017/04/14 16:12:55]

optional nit: I don't think this is necessary any more, and I'm working on
pulling these out of our configurations. If you'd like to keep it in for now for
consistency, though, I'm ok with it.

[nednguyen, 2017/04/14 16:16:06]

Yeah, if we remove these, I prefer doing that in a mass refactoring CL to keep
the configs consistent.

+          "telemetry_unittests_run"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "android_devices": "6",
+              "device_os": "MMB29Q",
+              "device_type": "bullhead"
+            }
+          ],
+          "hard_timeout": 960,

[nednguyen, 2017/04/14 16:10:21]

this is 16 minutes, whereas the usual runtime of this on catapult CQ is 8
minutes 30s

+          "shards": 1
+        }
+      }
     ]
   },
   "Marshmallow Tablet Tester": {
     "gtest_tests": [
       {
         "test": "android_webview_unittests"
       },
       {
         "test": "base_unittests"
       },
@@ skipping 88 matching lines @@
       },
       {
         "test": "chrome_sync_shell_test_apk"
       },
       {
         "test": "content_shell_test_apk"
       }
     ]
   }
 }