When converting between units of time or data types of different precision,...

base/time.cc

Index: base/time.cc
===================================================================
--- base/time.cc	(revision 26941)
+++ base/time.cc	(working copy)
@@ -41,6 +41,11 @@
   return delta_ / Time::kMicrosecondsPerMillisecond;
 }
 
+int64 TimeDelta::InMillisecondsRoundedUp() const {
+  return (delta_ + Time::kMicrosecondsPerMillisecond - 1) /
+      Time::kMicrosecondsPerMillisecond;
+}
+
 int64 TimeDelta::InMicroseconds() const {
   return delta_;
 }