Fix last leak in ozone_unittests and run it on the cros lsan/asan bot.

Introduce a move-only ScopedWlArray to make sure all wl_arrays in the tests
get wl_array_release()d when they are no longer needed.

Also rename SetWlArrayWithState() to AddStateToWlArray() since it appends
to its argument and doesn't replace the contents (this part has no behavior
change).

TBR=kbr

Bug: 855588
Change-Id: I384ca182b44c9cb864d2d3e94c8ed4f0a0a16f77
Reviewed-on: https://chromium-review.googlesource.com/1113658
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570160}

testing/buildbot/chromium.memory.json

@@ -4621,6 +4621,12 @@
         },
         "test": "ozone_gl_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "ozone_unittests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true

testing/buildbot/test_suite_exceptions.pyl

@@ -1781,12 +1781,6 @@
       'Out of Process Profiling Windows',
     ],
   },
-  'ozone_unittests': {
-    'remove_from': [
-      # chromium.memory
-      'Linux Chromium OS ASan LSan Tests (1)',  # https://crbug.com/855588
-    ],
-  },
   'printing_unittests': {
     'remove_from': [
       # chromium.chromiumos