Add blink unit tests to the linux/mac/windows builders.

testing/buildbot/chromium.linux.json

 {
   "Android Arm64 Builder (dbg)": {
     "additional_compile_targets": [
       "all"
     ]
   },
   "Android Builder": {
     "additional_compile_targets": [
       "cronet_test_instrumentation_apk",
       "system_webview_apk"
@@ skipping 2980 matching lines @@
         "test": "base_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "battor_agent_unittests"
       },
       {
         "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "blink_heap_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "blink_platform_unittests"
+      },
+      {
+        "swarming": {
           "can_use_on_swarming_builders": true,
           "shards": 5
         },
         "test": "browser_tests"
       },
       {
         "args": [
           "--enable-browser-side-navigation"
         ],
         "name": "browser_side_navigation_browser_tests",
@@ skipping 555 matching lines @@
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "views_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "webkit_unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "wm_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "wtf_unittests"
       }
     ],
     "isolated_scripts": [
       {
         "isolate_name": "content_shell_crash_test",
         "name": "content_shell_crash_test",
         "swarming": {
           "can_use_on_swarming_builders": true
         }
       },
@@ skipping 1066 matching lines @@
         "isolate_name": "telemetry_unittests",
         "name": "telemetry_unittests",
         "swarming": {
           "can_use_on_swarming_builders": true,
           "shards": 4
         }
       }
     ]
   }
 }