Run native_theme unittests everywhere we run views_unittests.

testing/buildbot/chromium.memory.json

Index: testing/buildbot/chromium.memory.json
diff --git a/testing/buildbot/chromium.memory.json b/testing/buildbot/chromium.memory.json
index 1af77e3ca1912dcd179fbef2273edaab44200192..59cbb9d6adcc0625e6ea843330c3d2452f26f56e 100644
--- a/testing/buildbot/chromium.memory.json
+++ b/testing/buildbot/chromium.memory.json
@@ -487,6 +487,12 @@
       },
       {
         "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "native_theme_unittests"
+      },
+      {
+        "swarming": {
           "can_use_on_swarming_builders": true,
           "shards": 4
         },
@@ -720,6 +726,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "native_theme_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "net_unittests"
       },
       {