Host fingerprint mojo service within the device service.

device/fingerprint/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("//build/config/features.gni")
+
+component("fingerprint") {
+  sources = [
+    "fingerprint_export.h",
+    "fingerprint_impl.cc",
+    "fingerprint_impl.h",
+  ]
+
+  defines = [ "DEVICE_FINGERPRINT_IMPLEMENTATION" ]
+
+  deps = [
+    "//base",
+    "//mojo/public/cpp/bindings",
+  ]
+
+  if (is_chromeos) {
+    deps += [ "//chromeos" ]
+  }
+
+  public_deps = [
+    "//device/fingerprint/public/interfaces",
+  ]
+}