Add printing.dll to the component build.

printing/printing.gyp

 # Copyright (c) 2011 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'printing',
-      'type': 'static_library',
+      'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
         '../base/base.gyp:base_i18n',
         '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../build/temp_gyp/googleurl.gyp:googleurl',
         '../skia/skia.gyp:skia',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
-        '../ui/ui.gyp:ui',  # Only required for Font support.
+        '../ui/ui.gyp:ui',
+      ],
+      'defines': [
+        'PRINTING_IMPLEMENTATION',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'backend/print_backend.cc',
         'backend/print_backend.h',
         'backend/print_backend_consts.cc',
         'backend/print_backend_consts.h',
         'backend/print_backend_dummy.cc',
@@ skipping 127 matching lines @@
         }],
       ],
     },
     {
       'target_name': 'printing_unittests',
       'type': 'executable',
       'dependencies': [
         'printing',
         '../testing/gtest.gyp:gtest',
         '../base/base.gyp:test_support_base',
+        '../ui/ui.gyp:ui',
       ],
       'sources': [
         'emf_win_unittest.cc',
         'printing_test.h',
         'page_number_unittest.cc',
         'page_range_unittest.cc',
         'page_setup_unittest.cc',
         'pdf_metafile_cairo_linux_unittest.cc',
         'pdf_metafile_cg_mac_unittest.cc',
         'printed_page_unittest.cc',
@@ skipping 46 matching lines @@
                   ],
                 },
               }],
             ],
           },
         }],
       ],
     },
   ],
 }