Add final part of IPC plumbing for FileSystem API

chrome/common/common_param_traits.cc

Index: chrome/common/common_param_traits.cc
diff --git a/chrome/common/common_param_traits.cc b/chrome/common/common_param_traits.cc
index 19ef93bd85b6c0670436e52c78c8db5ff21bfd40..cf6ea50268ed8e852ecc202da4d445a492fcbfa3 100644
--- a/chrome/common/common_param_traits.cc
+++ b/chrome/common/common_param_traits.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/common/common_param_traits.h"
 
+#include "base/time.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/content_settings.h"
 #include "chrome/common/geoposition.h"
@@ -579,4 +580,34 @@ void ParamTraits<printing::NativeMetafile>::Log(
   l->append("<printing::NativeMetafile>");
 }
 
+void ParamTraits<file_util::FileInfo>::Write(
+    Message* m, const param_type& p) {
+  WriteParam(m, p.size);
+  WriteParam(m, p.is_directory);
+  WriteParam(m, p.last_modified.ToDoubleT());
+}
+
+bool ParamTraits<file_util::FileInfo>::Read(
+    const Message* m, void** iter, param_type* p) {
+  double last_modified;
+  bool result =
+      ReadParam(m, iter, &p->size) &&
+      ReadParam(m, iter, &p->is_directory) &&
+      ReadParam(m, iter, &last_modified);
+  if (result)
+    p->last_modified = base::Time::FromDoubleT(last_modified);
+  return result;
+}
+
+void ParamTraits<file_util::FileInfo>::Log(
+    const param_type& p, std::string* l) {
+  l->append("(");
+  LogParam(p.size, l);
+  l->append(",");
+  LogParam(p.is_directory, l);
+  l->append(",");
+  LogParam(p.last_modified.ToDoubleT(), l);
+  l->append(")");
+}
+
 }  // namespace IPC