Get fuchsia fyi to run base_unittests

Bug: 707029, 706592
Change-Id: I08963922fd177c0023e9be1f6eb82491b4f33dcb
Reviewed-on: https://chromium-review.googlesource.com/531658Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478821}

testing/buildbot/chromium.fyi.json

@@ -10133,12 +10133,28 @@
     "additional_compile_targets": [
       "base_unittests",
       "d8"
+    ],
+    "gtest_tests": [
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": false
+        },
+        "test": "base_unittests"
+      }
     ]
   },
   "Fuchsia (dbg)": {
     "additional_compile_targets": [
       "base_unittests",
       "d8"
+    ],
+    "gtest_tests": [
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": false
+        },
+        "test": "base_unittests"
+      }
     ]
   },
   "Headless Linux (dbg)": {