Convert wm_unittests to run exclusively on Swarming

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 c3d004ebbd5eff64aae41f6a18c6d3a35269c0a3..071b43e5c3cc52894c20e83a1955a65000381903 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -259,6 +259,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "wm_unittests"
       }
     ],
@@ -554,6 +557,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "wm_unittests"
       }
     ],
@@ -968,6 +974,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "wm_unittests"
       }
     ],
@@ -1243,6 +1252,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "wm_unittests"
       }
     ],
@@ -1675,6 +1687,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "wm_unittests"
       }
     ],