Adds support for headless chrome embedder mojo services

headless/lib/embedder_test.mojom

Index: headless/lib/embedder_test.mojom
diff --git a/cc/ipc/filter_operations.mojom b/headless/lib/embedder_test.mojom
similarity index 50%
copy from cc/ipc/filter_operations.mojom
copy to headless/lib/embedder_test.mojom
index 9e94216aefe2c30443cac53624263a9f0cfad188..553709a198651778898a7dd081d802896f1b81cb 100644
--- a/cc/ipc/filter_operations.mojom
+++ b/headless/lib/embedder_test.mojom
@@ -2,12 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module cc.mojom;
+module embedder_test;
 
-import "cc/ipc/filter_operation.mojom";
-
-// See cc/output/filter_operations.h.
-struct FilterOperations {
-  array<cc.mojom.FilterOperation> operations;
+// An example embedder Mojo service.
+interface TestEmbedderService {
+  // Returns a test result to the embedder.
+  ReturnTestResult(string result);
 };
-