Add cloud_print_unittests to the GN build.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 27 matching lines @@
 
   deps = [
     "//base:base_unittests",
     "//cc:cc_unittests",
     "//chrome",
     "//chrome/test:browser_tests",
     "//chrome/test:interactive_ui_tests",
     "//chrome/test:sync_integration_tests",
     "//chrome/test:unit_tests",
     "//chrome/test/chromedriver:chromedriver_unittests",
+    "//cloud_print:cloud_print_unittests",
     "//components:components_browsertests",
     "//components:components_unittests",
     "//components/policy:policy_templates",
     "//content/shell:content_shell",
     "//content/test:content_browsertests",
     "//content/test:content_perftests",
     "//content/test:content_unittests",
     "//crypto:crypto_unittests",
     "//extensions:extensions_browsertests",
     "//extensions:extensions_unittests",
@@ skipping 598 matching lines @@
 
       # Note:
       # (*) Fails but failures match GYP build at time of testing.
     ]
 
     if (enable_nacl) {
       deps += [ "//components/nacl:nacl_loader_unittests" ]  # PASSES 3/28/2015
     }
   }
 }