[Sync] Enable Sync_integration_tests on chromeos

testing/buildbot/chromium.chromiumos.json

Index: testing/buildbot/chromium.chromiumos.json
diff --git a/testing/buildbot/chromium.chromiumos.json b/testing/buildbot/chromium.chromiumos.json
index 171db6c465e30d2f70399a505130244dc2d05813..8bc2d57436dc62d118e3f420b6b7ececdee8010d 100644
--- a/testing/buildbot/chromium.chromiumos.json
+++ b/testing/buildbot/chromium.chromiumos.json
@@ -393,6 +393,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "sync_integration_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_arc_unittests"
       },
       {
@@ -770,6 +776,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "sync_integration_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_arc_unittests"
       },
       {
@@ -1116,6 +1128,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "sync_integration_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_arc_unittests"
       },
       {