Implement HitTestAggregator

services/viz/hit_test/public/interfaces/BUILD.gn

Index: services/viz/hit_test/public/interfaces/BUILD.gn
diff --git a/services/viz/hit_test/public/interfaces/BUILD.gn b/services/viz/hit_test/public/interfaces/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..17b404b2701dff7ed6ad7d080fb43b8c85a48630
--- /dev/null
+++ b/services/viz/hit_test/public/interfaces/BUILD.gn
@@ -0,0 +1,17 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# 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")
+
+mojom("interfaces") {
+  sources = [
+    "hit_test_data.mojom",
+  ]
+
+  public_deps = [
+    "//cc/ipc:interfaces",
+    "//ui/gfx/geometry/mojo",
+    "//ui/gfx/mojo",
+  ]
+}