Add PDF compositor service

components/printing/service/BUILD.gn

+# 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("//services/service_manager/public/cpp/service.gni")
+import("//services/service_manager/public/service_manifest.gni")
+
+static_library("service") {
+  sources = [
+    "pdf_compositor_impl.cc",
+    "pdf_compositor_impl.h",
+    "pdf_compositor_service.cc",
+    "pdf_compositor_service.h",
+  ]
+
+  deps = [
+    "//base",
+    "//components/discardable_memory/client",
+    "//components/discardable_memory/public/interfaces",
+    "//content/public/common:service_names",
+    "//skia",
+  ]
+
+  public_deps = [
+    "//components/printing/service/public/interfaces",
+    "//services/service_manager/public/cpp",
+  ]
+}
+
+service_manifest("pdf_compositor_manifest") {
+  name = "pdf_compositor"
+  source = "pdf_compositor_manifest.json"
+}