[Android] Adding scheduling through GcmNetworkManager

testing/buildbot/chromium.linux.json

 {
   "Android Arm64 Builder (dbg)": {
     "additional_compile_targets": [
       "all"
     ]
   },
   "Android Builder": {
     "additional_compile_targets": [
       "cronet_test_instrumentation_apk",
       "system_webview_apk"
@@ skipping 1223 matching lines @@
       }
     ],
     "junit_tests": [
       {
         "test": "base_junit_tests"
       },
       {
         "test": "chrome_junit_tests"
       },
       {
+        "test": "components_background_task_scheduler_junit_tests"
+      },
+      {
         "test": "components_gcm_driver_junit_tests"
       },
       {
         "test": "components_invalidation_impl_junit_tests"
       },
       {
         "test": "components_policy_junit_tests"
       },
       {
         "test": "components_web_restrictions_junit_tests"
@@ skipping 3336 matching lines @@
         "isolate_name": "telemetry_unittests",
         "name": "telemetry_unittests",
         "swarming": {
           "can_use_on_swarming_builders": true,
           "shards": 4
         }
       }
     ]
   }
 }