media: scaffolding and plumbing for MojoRenderer{Impl, Service}

media/mojo/BUILD.gn

 # Copyright 2014 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.
 
-static_library("common") {
-  sources = [
-    "thumbnail_score.cc",
-    "thumbnail_score.h",
-  ]
-
-  deps = [
-    "//base",
+group("mojo") {
+  public_deps = [
+    "//media/mojo/interfaces",
+    "//media/mojo/services",
   ]
 }
+
+group("tests") {
+  testonly = true
+  deps = [
+    "//media/mojo/services:tests"
+  ]  
+}