Convert blink_heap_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 d0f332513ade29a1679be28045bf2470b0305d2d..a7176072df05b6898709bff016e4628351b710e9 100644
--- a/testing/buildbot/chromium.webkit.json
+++ b/testing/buildbot/chromium.webkit.json
@@ -663,6 +663,9 @@
   "WebKit Linux": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -689,6 +692,9 @@
   "WebKit Linux (dbg)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -715,6 +721,9 @@
   "WebKit Linux 32": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -741,6 +750,9 @@
   "WebKit Linux Leak": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -767,6 +779,9 @@
   "WebKit Linux Oilpan": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -793,6 +808,9 @@
   "WebKit Linux Oilpan (dbg)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -819,6 +837,9 @@
   "WebKit Linux Oilpan Leak": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -845,6 +866,9 @@
   "WebKit Linux Trusty": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -871,6 +895,9 @@
   "WebKit Mac Oilpan": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -897,6 +924,9 @@
   "WebKit Mac Oilpan (dbg)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -923,6 +953,9 @@
   "WebKit Mac10.10": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -949,6 +982,9 @@
   "WebKit Mac10.6": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -975,6 +1011,9 @@
   "WebKit Mac10.6 (dbg)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1001,6 +1040,9 @@
   "WebKit Mac10.7": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1027,6 +1069,9 @@
   "WebKit Mac10.7 (dbg)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1053,6 +1098,9 @@
   "WebKit Mac10.8": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1079,6 +1127,9 @@
   "WebKit Mac10.9": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1105,6 +1156,9 @@
   "WebKit Mac10.9 (retina)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1131,6 +1185,9 @@
   "WebKit Win Oilpan": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1157,6 +1214,9 @@
   "WebKit Win Oilpan (dbg)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1183,6 +1243,9 @@
   "WebKit Win x64 Builder": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1199,6 +1262,9 @@
   "WebKit Win x64 Builder (dbg)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1215,6 +1281,9 @@
   "WebKit Win10": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1241,6 +1310,9 @@
   "WebKit Win7": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1267,6 +1339,9 @@
   "WebKit Win7 (dbg)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {
@@ -1293,6 +1368,9 @@
   "WebKit XP": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "blink_heap_unittests"
       },
       {