Convert blink_platform_unittests 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 d1be4e96aae7b90300213be5d52d41c5b8f8b4ff..21e8c8afc30ba4062c19cfe29af84cd82a2df595 100644
--- a/testing/buildbot/chromium.fyi.json
+++ b/testing/buildbot/chromium.fyi.json
@@ -663,6 +663,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -868,6 +871,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1029,6 +1035,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1234,6 +1243,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1425,6 +1437,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1580,6 +1595,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1735,6 +1753,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -1890,6 +1911,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -2045,6 +2069,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -2200,6 +2227,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -2937,6 +2967,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -3092,6 +3125,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -3247,6 +3283,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -3402,6 +3441,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -3554,6 +3596,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -3687,6 +3732,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {
@@ -3842,6 +3890,9 @@
         "test": "blink_heap_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_platform_unittests"
       },
       {