win: Partial fixes for client_test after CrashReportDatabase added

- Dependency on compat required for sys/types.h inclusion for ssize_t.
- Test impl of stat to avoid #error
- FileHandle isn't int on Windows.

client_test no longer links though, as it's still lacking an
implementation of CrashReportDatabase of course.

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

Review URL: https://codereview.chromium.org/875043004

client/client.gyp

@@ -18,6 +18,7 @@
       'target_name': 'client',
       'type': 'static_library',
       'dependencies': [
+        '../compat/compat.gyp:compat',
         '../third_party/mini_chromium/mini_chromium/base/base.gyp:base',
         '../util/util.gyp:util',
       ],
@@ -46,6 +47,7 @@
       'type': 'executable',
       'dependencies': [
         'client',
+        '../compat/compat.gyp:compat',
         '../third_party/gtest/gtest.gyp:gtest',
         '../third_party/gtest/gtest.gyp:gtest_main',
         '../third_party/mini_chromium/mini_chromium/base/base.gyp:base',

client/crash_report_database_test.cc

@@ -28,6 +28,9 @@ bool FileExistsAtPath(const base::FilePath& path) {
 #if defined(OS_POSIX)
   struct stat st;
   return lstat(path.value().c_str(), &st) == 0;
+#elif defined(OS_WIN)
+  struct _stat st;
+  return _wstat(path.value().c_str(), &st);
 #else
 #error "Not implemented"
 #endif
@@ -37,7 +40,11 @@ void CreateFile(const base::FilePath& path) {
   FileHandle handle = LoggingOpenFileForWrite(path,
                                               FileWriteMode::kCreateOrFail,
                                               FilePermissions::kWorldReadable);
+#if defined(OS_POSIX)
   ASSERT_GE(handle, 0);
+#elif defined(OS_WIN)
+  ASSERT_NE(handle, nullptr);
+#endif
   ASSERT_TRUE(
       LoggingWriteFile(handle, path.value().c_str(), path.value().length()));
   ASSERT_TRUE(LoggingCloseFile(handle));