Reland "Add base::TimeDelta::Max()" again.

media/base/media_log.cc

Index: media/base/media_log.cc
diff --git a/media/base/media_log.cc b/media/base/media_log.cc
index 6e21cff485a902c2f91ff0489e4df026ca5ebe6a..c689d7a46cdd934207ea3f66891587dd6dcf7406 100644
--- a/media/base/media_log.cc
+++ b/media/base/media_log.cc
@@ -141,7 +141,10 @@ scoped_ptr<MediaLogEvent> MediaLog::CreateStringEvent(
 scoped_ptr<MediaLogEvent> MediaLog::CreateTimeEvent(
     MediaLogEvent::Type type, const char* property, base::TimeDelta value) {
   scoped_ptr<MediaLogEvent> event(CreateEvent(type));
-  event->params.SetDouble(property, value.InSecondsF());
+  if (value.is_max())
+    event->params.SetString(property, "unknown");
+  else
+    event->params.SetDouble(property, value.InSecondsF());
   return event.Pass();
 }
 
@@ -228,4 +231,14 @@ void MediaLog::SetBooleanProperty(
   AddEvent(event.Pass());
 }
 
+void MediaLog::SetTimeProperty(
+    const char* key, base::TimeDelta value) {
+  scoped_ptr<MediaLogEvent> event(CreateEvent(MediaLogEvent::PROPERTY_CHANGE));
+  if (value.is_max())
+    event->params.SetString(key, "unknown");
+  else
+    event->params.SetDouble(key, value.InSecondsF());
+  AddEvent(event.Pass());
+}
+
 }  //namespace media