GN Windows component build fixes

media/midi/midi.gyp

 # Copyright 2015 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,
     'conditions': [
       ['(OS=="linux" or OS=="freebsd" or OS=="solaris") and (embedded!=1 or (chromecast==1 and target_arch!="arm"))', {
         'use_alsa%': 1,
       }, {
         'use_alsa%': 0,
       }],
     ],
     # Source files that are used in production code for Android, and in tests
     # for others.
     'usb_midi_sources': [
       'midi_manager_usb.cc',
       'midi_manager_usb.h',
       'usb_midi_descriptor_parser.cc',
       'usb_midi_descriptor_parser.h',
       'usb_midi_device.h',
+      'usb_midi_export.h',
       'usb_midi_input_stream.cc',
       'usb_midi_input_stream.h',
       'usb_midi_jack.h',
       'usb_midi_output_stream.cc',
       'usb_midi_output_stream.h',
     ],
   },
   'targets': [
     {
       # GN version: //media/midi
       'target_name': 'midi',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
       ],
       'defines': [
-        'MEDIA_IMPLEMENTATION',
+        'MIDI_IMPLEMENTATION',
       ],
       'include_dirs': [
         '../..',
       ],
       'sources': [
+        'midi_export.h',
         'midi_manager.cc',
         'midi_manager.h',
         'midi_manager_android.cc',
         'midi_manager_mac.cc',
         'midi_manager_mac.h',
         'midi_manager_win.cc',
         'midi_manager_win.h',
         'midi_message_queue.cc',
         'midi_message_queue.h',
         'midi_message_util.cc',
@@ skipping 36 matching lines @@
           'dependencies': [
             '../../base/base.gyp:base_i18n',
             'midi_jni_headers',
             'midi_java',
           ],
           'sources': [
             '<@(usb_midi_sources)',
             'midi_jni_registrar.cc',
             'midi_jni_registrar.h',
           ],
+          'defines': [
+            'EXPORT_USB_MIDI',
+          ],
         }],
         ['OS=="mac"', {
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/CoreAudio.framework',
               '$(SDKROOT)/System/Library/Frameworks/CoreMIDI.framework',
             ],
           },
         }],
         ['OS=="win"', {
           'dependencies': [
             '../../device/usb/usb.gyp:device_usb',
           ],
         }],
       ],  # conditions
     },
     {
       # GN version: //media/midi:midi_unittests
       'target_name': 'midi_unittests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         'midi',
         '../../base/base.gyp:base',
         '../../base/base.gyp:run_all_unittests',
         '../../testing/gtest.gyp:gtest',
       ],
-      'defines': [
-        'MEDIA_IMPLEMENTATION',
-      ],
       'include_dirs': [
         '../..',
       ],
       'sources': [
         'midi_manager_unittest.cc',
         'midi_manager_usb_unittest.cc',
         'midi_message_queue_unittest.cc',
         'midi_message_util_unittest.cc',
         'usb_midi_descriptor_parser_unittest.cc',
         'usb_midi_input_stream_unittest.cc',
@@ skipping 86 matching lines @@
             '../../build/isolate.gypi',
           ],
           'sources': [
             'midi_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }