Make FileStat have millisecond precisions, for linux, mac and android.

runtime/bin/file_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/file.h"
 
 #include <fcntl.h>  // NOLINT
@@ skipping 443 matching lines @@
     free(buffer);
     free(utf8_target);
     return NULL;
   }
   utf8_target[utf8_length] = '\0';
   free(buffer);
   return utf8_target;
 }
 
 
+static int64_t TimespecToMilliseconds(const struct timespec& t) {
+  return t.tv_sec * 1000 + t.tv_nsec / 1000000;
+}
+
+
 void File::Stat(const char* name, int64_t* data) {
   File::Type type = GetType(name, false);
   data[kType] = type;
   if (type != kDoesNotExist) {
     struct _stat64 st;
     const wchar_t* system_name = StringUtils::Utf8ToWide(name);
     int stat_status = _wstat64(system_name, &st);
     free(const_cast<wchar_t*>(system_name));
     if (stat_status == 0) {
-      data[kCreatedTime] = st.st_ctime;
-      data[kModifiedTime] = st.st_mtime;
-      data[kAccessedTime] = st.st_atime;
+      data[kCreatedTime] = st.st_ctime * 1000;
+      data[kModifiedTime] = st.st_mtime * 1000;
+      data[kAccessedTime] = st.st_atime * 1000;
       data[kMode] = st.st_mode;
       data[kSize] = st.st_size;
     } else {
       data[kType] = File::kDoesNotExist;
     }
   }
 }
 
 
 time_t File::LastModified(const char* name) {
@@ skipping 155 matching lines @@
     return kIdentical;
   } else {
     return kDifferent;
   }
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)