Add PDF compositor service

printing/common/BUILD.gn

Index: printing/common/BUILD.gn
diff --git a/printing/common/BUILD.gn b/printing/common/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..d1b74bb7a43b61260fda5a9ff67878d166e1e225
--- /dev/null
+++ b/printing/common/BUILD.gn
@@ -0,0 +1,15 @@
+# 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.
+
+source_set("common") {
+  sources = [
+    "pdf_metafile_utils.cc",
+    "pdf_metafile_utils.h",
+  ]
+
+  deps = [
+    "//base",
+    "//skia",
+  ]
+}