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

media/mojo/BUILD.gn

Index: media/mojo/BUILD.gn
diff --git a/components/history/core/common/BUILD.gn b/media/mojo/BUILD.gn
similarity index 51%
copy from components/history/core/common/BUILD.gn
copy to media/mojo/BUILD.gn
index 7a493141978ebc86786ede32720f563e8a537d74..d30848b19213bbd641e751c20fcd5be3dc8a6191 100644
--- a/components/history/core/common/BUILD.gn
+++ b/media/mojo/BUILD.gn
@@ -2,13 +2,16 @@
 # 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",
+group("mojo") {
+  public_deps = [
+    "//media/mojo/interfaces",
+    "//media/mojo/services",
   ]
+}
 
+group("tests") {
+  testonly = true
   deps = [
-    "//base",
-  ]
+    "//media/mojo/services:tests"
+  ]  
 }