Provide nanoseconds precision for base::PlatformFileInfo on POSIX

base/file_util_posix.cc

Index: base/file_util_posix.cc
diff --git a/base/file_util_posix.cc b/base/file_util_posix.cc
index 7ef09a200de29c96c1f3f49e7002e50798488ec0..9aeae43a72695de82a6119884d963bf2443a3085 100644
--- a/base/file_util_posix.cc
+++ b/base/file_util_posix.cc
@@ -588,9 +588,19 @@ bool GetFileInfo(const FilePath& file_path, base::PlatformFileInfo* results) {
     return false;
   results->is_directory = S_ISDIR(file_info.st_mode);
   results->size = file_info.st_size;
+#if defined(OS_MACOSX)
+  results->last_modified = base::Time::FromTimeSpec(file_info.st_mtimespec);
+  results->last_accessed = base::Time::FromTimeSpec(file_info.st_atimespec);
+  results->creation_time = base::Time::FromTimeSpec(file_info.st_ctimespec);
+#elif defined(OS_ANDROID)
   results->last_modified = base::Time::FromTimeT(file_info.st_mtime);
   results->last_accessed = base::Time::FromTimeT(file_info.st_atime);
   results->creation_time = base::Time::FromTimeT(file_info.st_ctime);
+#else
+  results->last_modified = base::Time::FromTimeSpec(file_info.st_mtim);
+  results->last_accessed = base::Time::FromTimeSpec(file_info.st_atim);
+  results->creation_time = base::Time::FromTimeSpec(file_info.st_ctim);
+#endif
   return true;
 }