Consistently swarm a few tests that were swarmed almost everywhere already.

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 2c201884ca925de8ce4b3f0be1b0fb4166e003d5..1aa996228870c393211ecf9056de1248119eeb1a 100644
--- a/testing/buildbot/chromium.fyi.json
+++ b/testing/buildbot/chromium.fyi.json
@@ -1055,9 +1055,15 @@
         "test": "cacheinvalidation_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cast_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cc_unittests"
       },
       {
@@ -1100,6 +1106,9 @@
         "test": "device_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "display_unittests"
       },
       {
@@ -1118,6 +1127,9 @@
         "test": "gcm_unit_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "gfx_unittests"
       },
       {
@@ -1223,6 +1235,9 @@
         "test": "remoting_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "sandbox_linux_unittests"
       },
       {
@@ -1336,9 +1351,15 @@
         "test": "cacheinvalidation_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cast_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cc_unittests"
       },
       {
@@ -1372,9 +1393,15 @@
         "test": "device_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "display_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "extensions_browsertests"
       },
       {
@@ -1390,6 +1417,9 @@
         "test": "gcm_unit_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "gfx_unittests"
       },
       {
@@ -1463,6 +1493,9 @@
         "test": "remoting_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "sandbox_linux_unittests"
       },
       {
@@ -1555,9 +1588,15 @@
         "test": "cacheinvalidation_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cast_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cc_unittests"
       },
       {
@@ -1580,9 +1619,15 @@
         "test": "device_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "display_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "extensions_browsertests"
       },
       {
@@ -1592,6 +1637,9 @@
         "test": "gcm_unit_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "gfx_unittests"
       },
       {
@@ -1640,6 +1688,9 @@
         "test": "remoting_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "sandbox_linux_unittests"
       },
       {
@@ -1715,9 +1766,15 @@
         "test": "cacheinvalidation_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cast_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cc_unittests"
       },
       {
@@ -1760,6 +1817,9 @@
         "test": "gcm_unit_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "gfx_unittests"
       },
       {
@@ -2007,9 +2067,15 @@
         "test": "cacheinvalidation_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cast_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cc_unittests"
       },
       {
@@ -2052,6 +2118,9 @@
         "test": "gcm_unit_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "gfx_unittests"
       },
       {
@@ -6771,6 +6840,9 @@
         "test": "device_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "display_unittests"
       },
       {