Introduce the image_decoder service

services/BUILD.gn

Index: services/BUILD.gn
diff --git a/services/BUILD.gn b/services/BUILD.gn
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index 0000000000000000000000000000000000000000..5cb1983d01b8f6db6ce775d27da5d6d53ae04eb6
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+++ b/services/BUILD.gn
@@ -0,0 +1,17 @@
+# Copyright 2016 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("//testing/test.gni")
+
+# One Big Target for services to register their unit test sources. This exists
+# to avoid having to maintain a separate test binary for every service.
+#
+# To add tests for a new service, please define a "tests" source_set in the
+# service subdirectory and add it as a dependency here.
+test("service_unittests") {
+  deps = [
+    "//services/image_decoder:tests",
+    "//services/service_manager/public/cpp/test:run_all_service_tests",
+  ]
+}