Implement the Notification `timestamp` property

content/browser/notifications/notification_database_data_unittest.cc

Index: content/browser/notifications/notification_database_data_unittest.cc
diff --git a/content/browser/notifications/notification_database_data_unittest.cc b/content/browser/notifications/notification_database_data_unittest.cc
index e2bf7d4c08e682dac096dccea3ea070889e05fcc..090ce0da4f8d8341d999b482f8dc892501526879 100644
--- a/content/browser/notifications/notification_database_data_unittest.cc
+++ b/content/browser/notifications/notification_database_data_unittest.cc
@@ -4,6 +4,7 @@
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/time/time.h"
 #include "content/browser/notifications/notification_database_data.pb.h"
 #include "content/browser/notifications/notification_database_data_conversions.h"
 #include "content/common/notification_constants.h"
@@ -23,6 +24,7 @@ const char kNotificationBody[] = "Hello, world!";
 const char kNotificationTag[] = "my_tag";
 const char kNotificationIconUrl[] = "https://example.com/icon.png";
 const int kNotificationVibrationPattern[] = { 100, 200, 300 };
+const double kNotificationTimestamp = 621046800.;
 const unsigned char kNotificationData[] = { 0xdf, 0xff, 0x0, 0x0, 0xff, 0xdf };
 
 TEST(NotificationDatabaseDataTest, SerializeAndDeserializeData) {
@@ -42,6 +44,7 @@ TEST(NotificationDatabaseDataTest, SerializeAndDeserializeData) {
   notification_data.tag = kNotificationTag;
   notification_data.icon = GURL(kNotificationIconUrl);
   notification_data.vibration_pattern = vibration_pattern;
+  notification_data.timestamp = base::Time::FromJsTime(kNotificationTimestamp);
   notification_data.silent = true;
   notification_data.require_interaction = true;
   notification_data.data = developer_data;
@@ -88,6 +91,7 @@ TEST(NotificationDatabaseDataTest, SerializeAndDeserializeData) {
   EXPECT_THAT(copied_notification_data.vibration_pattern,
       testing::ElementsAreArray(kNotificationVibrationPattern));
 
+  EXPECT_EQ(notification_data.timestamp, copied_notification_data.timestamp);
   EXPECT_EQ(notification_data.silent, copied_notification_data.silent);
   EXPECT_EQ(notification_data.require_interaction,
             copied_notification_data.require_interaction);