Run exo_unittests on the cros memory bots, it should pass now.

Bug: 855573
Change-Id: If84f612e1500d9189f2206a4ff106fccfdc308d5
Reviewed-on: https://chromium-review.googlesource.com/1112468Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569877}

testing/buildbot/chromium.memory.json

@@ -4454,6 +4454,12 @@
         },
         "test": "events_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "exo_unittests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
@@ -5022,6 +5028,12 @@
         },
         "test": "events_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "exo_unittests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true

testing/buildbot/test_suites.pyl

@@ -1810,7 +1810,7 @@
   # TODO(thakis): Fix all failing tests, add them here, then remove this.
   'linux_chromeos_rel_specific_gtests_asan_bringup': {
     'chromevox_tests': {},
-    #'exo_unittests': {},  # https://crbug.com/855573
+    'exo_unittests': {},
     'gl_unittests_ozone': {},
     'ozone_gl_unittests': {
       'args': [