Add: check exploded time is properly converted

base/time/time.cc

Index: base/time/time.cc
diff --git a/base/time/time.cc b/base/time/time.cc
index 76ffeb744112d1909afa9b488bcfa277950225bb..8b1a6d783baf329679d4c091e7093fb8bc302d4e 100644
--- a/base/time/time.cc
+++ b/base/time/time.cc
@@ -263,6 +263,14 @@ bool Time::FromStringInternal(const char* time_string,
   return true;
 }
 
+// static
+bool Time::ExplodedMostlyEquals(const Exploded& lhs, const Exploded& rhs) {
+  return lhs.year == rhs.year && lhs.month == rhs.month &&
+         lhs.day_of_month == rhs.day_of_month && lhs.hour == rhs.hour &&
+         lhs.minute == rhs.minute && lhs.second == rhs.second &&
+         lhs.millisecond == rhs.millisecond;
+}
+
 std::ostream& operator<<(std::ostream& os, Time time) {
   Time::Exploded exploded;
   time.UTCExplode(&exploded);