Add storage_unittests to buildbots.

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 a4146168b6d57f09e80e250b3017ea229c0083b2..6c14a3f4d9e6cf73833e4638afdb5fabffa30f0a 100644
--- a/testing/buildbot/chromium.memory.json
+++ b/testing/buildbot/chromium.memory.json
@@ -231,6 +231,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "storage_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_base_unittests"
       },
       {
@@ -532,6 +538,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "storage_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_arc_unittests"
       },
       {
@@ -750,6 +762,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "storage_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_base_unittests"
       },
       {