Replace IPC messages in layout_test_render_frame_observer.

content/shell/common/layout_test.typemap

Index: content/shell/common/layout_test.typemap
diff --git a/content/shell/common/layout_test.typemap b/content/shell/common/layout_test.typemap
new file mode 100644
index 0000000000000000000000000000000000000000..c26c88df279096ebc940043512ccf273467d08d6
--- /dev/null
+++ b/content/shell/common/layout_test.typemap
@@ -0,0 +1,14 @@
+# 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.
+
+mojom = "//content/shell/common/layout_test.mojom"
+public_headers = [ "//content/shell/common/shell_test_configuration.h" ]
+traits_headers = [ "//content/shell/common/shell_param_traits.h" ]
+public_deps = [
+  "//content/public/common",
+  "//ipc",
+  "//ui/gfx/ipc",
+]
+type_mappings =
+    [ "content.mojom.ShellTestConfig=content::ShellTestConfiguration" ]