win: Add compat header for sys/types.h

To add definition of ssize_t. Uses #include <../include/...> to
emulate #include_next, similar to the mac headers.

BUG=crashpad:1
R=mark@chromium.org

Review URL: https://codereview.chromium.org/793013002

compat/compat.gyp

@@ -29,6 +29,7 @@
         'non_win/timezoneapi.h',
         'non_win/verrsrc.h',
         'non_win/winnt.h',
+        'win/sys/types.h',
       ],
       'conditions': [
         ['OS=="mac"', {
@@ -44,7 +45,16 @@
             ],
           },
         }],
-        ['OS!="win"', {
+        ['OS=="win"', {
+          'include_dirs': [
+            'win',
+          ],
+          'direct_dependent_settings': {
+            'include_dirs': [
+              'win',
+            ],
+          },
+        }, {
           'include_dirs': [
             'non_win',
           ],

compat/win/sys/types.h

@@ -0,0 +1,27 @@
+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_COMPAT_WIN_SYS_TYPES_H_
+#define CRASHPAD_COMPAT_WIN_SYS_TYPES_H_
+
+// This is intended to be roughly equivalent to #include_next.
+#include <../include/sys/types.h>
+
+#ifdef _WIN64
+typedef __int64 ssize_t;
+#else
+typedef _W64 int ssize_t;
+#endif
+
+#endif  // CRASHPAD_COMPAT_WIN_SYS_TYPES_H_