Adding Athenas browser and unit tests which are required for running the tests on a buildbot

testing/buildbot/chromium.fyi.json

 {
   "Linux Trusty": {
     "gtest_tests": [
       "accessibility_unittests",
       "app_list_unittests",
       "app_shell_unittests",
       "aura_unittests",
       "interactive_ui_tests",
       "base_unittests",
       "cacheinvalidation_unittests",
@@ skipping 265 matching lines @@
       "sandbox_mac_unittests",
       "sql_unittests",
       "sync_integration_tests",
       "sync_unit_tests",
       "ui_unittests",
       "unit_tests",
       "url_unittests",
       "browser_tests"
     ]
   },
+  "Linux ChromiumOS Athena Tests (1)": {
+    "gtest_tests": [
+      {
+        "test": "athena_unittests",
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        }
+      },
+      {
+        "test": "browser_tests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "shards": 5
+        }
+      }
+    ]
+  },
   "Site Isolation Linux": {
     "gtest_tests": [
       { "test": "content_unittests", "args": ["--site-per-process"] },
       { "test": "content_browsertests", "args": ["--site-per-process"] }
     ]
   },
   "Site Isolation Win": {
     "gtest_tests": [
       { "test": "content_unittests", "args": ["--site-per-process"] },
       { "test": "content_browsertests", "args": ["--site-per-process"] }
     ]
   }
 }