net: Build net.dll on Windows.

net/net.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': 'net',
-      'type': 'static_library',
       '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',
         '../crypto/crypto.gyp:crypto',
         '../sdch/sdch.gyp:sdch',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         '../third_party/zlib/zlib.gyp:zlib',
@@ skipping 758 matching lines @@
               'third_party/mozilla_security_manager/nsNSSCertificateDB.cpp',
               'third_party/mozilla_security_manager/nsNSSCertificateDB.h',
               'third_party/mozilla_security_manager/nsNSSCertTrust.cpp',
               'third_party/mozilla_security_manager/nsNSSCertTrust.h',
               'third_party/mozilla_security_manager/nsPKCS12Blob.cpp',
               'third_party/mozilla_security_manager/nsPKCS12Blob.h',
             ],
           },
         ],
         [ 'OS == "win"', {
+            'type': '<(component)',
             'sources!': [
               'http/http_auth_handler_ntlm_portable.cc',
               'socket/tcp_client_socket_libevent.cc',
               'socket/tcp_client_socket_libevent.h',
               'socket/tcp_server_socket_libevent.cc',
               'socket/tcp_server_socket_libevent.h',
               'udp/udp_socket_libevent.cc',
               'udp/udp_socket_libevent.h',
             ],
             'dependencies': [
               '../third_party/nss/nss.gyp:nspr',
               '../third_party/nss/nss.gyp:nss',
               'third_party/nss/ssl.gyp:ssl',
               'tld_cleanup',
             ],
-          },
-          {  # else: OS != "win"
+          }, { # else: OS != "win"
+            'type': 'static_library',
             'sources!': [
               'base/winsock_init.cc',
               'base/winsock_init.h',
               'base/winsock_util.cc',
               'base/winsock_util.h',
               'proxy/proxy_resolver_winhttp.cc',
               'proxy/proxy_resolver_winhttp.h',
             ],
           },
         ],
+        [ 'OS == "win" and component == "shared_library"', {
+          'defines': [
+            'NET_DLL',
+            'NET_IMPLEMENTATION',
+          ],
+          'msvs_disabled_warnings': [
+            # class 'std::xx' needs to have dll-interface.
+            4251,
+          ],
+          'direct_dependent_settings': {
+            'defines': [
+              'NET_DLL',
+            ],
+            'msvs_disabled_warnings': [
+              4251,
+            ],
+          },
+        }],
         [ 'OS == "mac"', {
             'dependencies': [
               '../third_party/nss/nss.gyp:nspr',
               '../third_party/nss/nss.gyp:nss',
               'third_party/nss/ssl.gyp:ssl',
             ],
             'link_settings': {
               'libraries': [
                 '$(SDKROOT)/System/Library/Frameworks/Security.framework',
                 '$(SDKROOT)/System/Library/Frameworks/SystemConfiguration.framework',
@@ skipping 627 matching lines @@
       ],
     }],
   ],
 }
 
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