Convert blink_platform_unittests to run exclusively on Swarming

testing/buildbot/chromium.webkit.json

Index: testing/buildbot/chromium.webkit.json
diff --git a/testing/buildbot/chromium.webkit.json b/testing/buildbot/chromium.webkit.json
index a7176072df05b6898709bff016e4628351b710e9..235768224b7498a152581a9649b8670d70badb51 100644
--- a/testing/buildbot/chromium.webkit.json
+++ b/testing/buildbot/chromium.webkit.json
@@ -669,6 +669,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -698,6 +701,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -727,6 +733,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -756,6 +765,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -785,6 +797,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -814,6 +829,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -843,6 +861,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -872,6 +893,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -901,6 +925,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -930,6 +957,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -959,6 +989,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -988,6 +1021,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1017,6 +1053,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1046,6 +1085,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1075,6 +1117,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1104,6 +1149,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1133,6 +1181,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1162,6 +1213,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1191,6 +1245,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1220,6 +1277,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1249,6 +1309,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1268,6 +1331,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1287,6 +1353,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1316,6 +1385,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1345,6 +1417,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1374,6 +1449,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {