Swarm components_unittests.

testing/buildbot/chromium_trybot.json

 {
   "compile_targets": [
     "all"
   ],
   "gtest_tests": [
     {
       "test": "accessibility_unittests",
       "swarming": {
         "can_use_on_swarming_builders": true
       }
@@ skipping 49 matching lines @@
         "chromium_chromeos",
         "chromium_chromeos_clang",
         "chromium_chromeos_ozone"
       ]
     },
     {
       "test": "chrome_elf_unittests",
       "platforms": ["win"]
     },
     "components_browsertests",
-    "components_unittests",
+    {
+      "test": "components_unittests",
+      "swarming": {
+        "can_use_on_swarming_builders": true
+      }
+    },
     {
       "test": "compositor_unittests",
       "platforms": ["linux", "win"]
     },
     {
       "test": "courgette_unittests",
       "platforms": ["win"]
     },
     {
       "test": "content_browsertests",
@@ skipping 196 matching lines @@
   "non_filter_tests_builders": [
   ],
 
   "filter_compile_builders": [
     "win_chromium_compile_dbg",
     "win_chromium_rel_swarming",
     "win_chromium_x64_rel_swarming",
     "win8_chromium_rel"
   ]
 }