Convert Mojo tests to use swarming.

mojo/public/js/BUILD.gn

Index: mojo/public/js/BUILD.gn
diff --git a/mojo/public/js/BUILD.gn b/mojo/public/js/BUILD.gn
index 4b86e6eb9a562f6c158fd557c8d67ee633dbc722..eda7e04d07ef67f2e819bcbfb6fa1da79803f8bc 100644
--- a/mojo/public/js/BUILD.gn
+++ b/mojo/public/js/BUILD.gn
@@ -8,3 +8,38 @@ source_set("js") {
     "constants.h",
   ]
 }
+
+group("bindings") {
+  data = [
+    "bindings.js",
+    "buffer.js",
+    "codec.js",
+    "connection.js",
+    "connector.js",
+    "constants.cc",
+    "constants.h",
+    "core.js",
+    "router.js",
+    "support.js",
+    "threading.js",
+    "unicode.js",
+    "validator.js",
+  ]
+}
+
+group("tests") {
+  testonly = true
+
+  data = [
+    "codec_unittests.js",
+    "core_unittests.js",
+    "struct_unittests.js",
+    "test/validation_test_input_parser.js",
+    "union_unittests.js",
+    "validation_unittests.js",
+    "//mojo/public/interfaces/bindings/tests/data/validation/",
+  ]
+  public_deps = [
+    ":bindings",
+  ]
+}