Separate sources that depend on printing into a different group.

chrome/common/BUILD.gn

 # Copyright 2014 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("//tools/grit/grit_rule.gni")
 import("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
 import("//chrome/version.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("../chrome_common.gypi") ],
@@ skipping 161 matching lines @@
   if (is_chromeos) {
     public_deps += [ "//chromeos" ]
   }
 
   if (enable_nacl) {
     public_deps += [ "//components/nacl:nacl_common" ]
   }
 
   # Printing.
   if (enable_basic_printing || enable_print_preview) {
+    sources +=
+        rebase_path(gypi_values.chrome_common_printing_sources, ".", "//chrome")
+
     public_deps += [
       "//components/printing/common",
       "//printing",
     ]
     if (enable_print_preview) {
       # Full printing support.
       sources += rebase_path(gypi_values.chrome_common_service_process_sources,
                              ".",
                              "//chrome")
     }
@@ skipping 189 matching lines @@
     ":constants",
     "//base",
   ]
 }
 
 mojom("mojo_bindings") {
   sources = [
     "resource_usage_reporter.mojom",
   ]
 }