Adds support for headless chrome embedder mojo services

headless/BUILD.gn

Index: headless/BUILD.gn
diff --git a/headless/BUILD.gn b/headless/BUILD.gn
index 8ebf07e9a9b460aaf61ac6328c03b25e7e971d63..96f0b914c7e7f8a5c8ca4f1c26556cc30efa2fdc 100644
--- a/headless/BUILD.gn
+++ b/headless/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
@@ -316,8 +317,15 @@ action("client_api_generator_tests") {
   ]
 }
 
+mojom("embedder_mojo_for_testing") {
+  sources = [
+    "lib/embedder_test.mojom",
+  ]
+}
+
 test("headless_browsertests") {
   sources = [
+    "lib/embedder_mojo_browsertest.cc",
     "lib/headless_browser_browsertest.cc",
     "lib/headless_devtools_client_browsertest.cc",
     "lib/headless_web_contents_browsertest.cc",
@@ -329,6 +337,7 @@ test("headless_browsertests") {
   defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
 
   deps = [
+    ":embedder_mojo_for_testing",
     "//base",
     "//content/test:browsertest_base",
     "//content/test:test_support",