Convert webkit_unit_tests to run exclusively on Swarming

testing/buildbot/chromium.fyi.json

Index: testing/buildbot/chromium.fyi.json
diff --git a/testing/buildbot/chromium.fyi.json b/testing/buildbot/chromium.fyi.json
index 27a5cec662f1ce23547c82d499cf64205f154f2b..dc03ebc0459d64b3530932ed48642f96bfc8d3fe 100644
--- a/testing/buildbot/chromium.fyi.json
+++ b/testing/buildbot/chromium.fyi.json
@@ -831,6 +831,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -1006,6 +1009,9 @@
         "test": "url_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -1200,6 +1206,9 @@
         "test": "url_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -1403,6 +1412,9 @@
         "test": "url_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -1582,6 +1594,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -1743,6 +1758,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -1904,6 +1922,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -2065,6 +2086,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -2226,6 +2250,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -2399,6 +2426,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -3130,6 +3160,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -3291,6 +3324,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -3452,6 +3488,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -3613,6 +3652,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -3749,6 +3791,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -3910,6 +3955,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {
@@ -4071,6 +4119,9 @@
         "test": "views_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "webkit_unit_tests"
       },
       {