Add storage_unittests to buildbots.

testing/buildbot/chromium.win.json

Index: testing/buildbot/chromium.win.json
diff --git a/testing/buildbot/chromium.win.json b/testing/buildbot/chromium.win.json
index 33ab1a633d0a3680704ab62156df86fc5451bec1..8f17fb6cc00510f749c95c1790e5639a8dea31cc 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -424,6 +424,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "storage_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "sync_integration_tests"
       },
       {
@@ -887,6 +893,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "storage_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "sync_integration_tests"
       },
       {
@@ -1381,6 +1393,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "storage_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "sync_integration_tests"
       },
       {
@@ -1786,6 +1804,12 @@
       },
       {
         "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "storage_unittests"
+      },
+      {
+        "swarming": {
           "can_use_on_swarming_builders": true,
           "shards": 2
         },