This is a second attempt at submitting this changelist. The original one was...

base/time.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Time represents an absolute point in time, internally represented as
 // microseconds (s/1,000,000) since a platform-dependent epoch.  Each
 // platform's epoch, along with other system-dependent clock interface
 // routines, is defined in time_PLATFORM.cc.
 //
 // TimeDelta represents a duration of time, internally represented in
@@ skipping 46 matching lines @@
 
   // Returns the internal numeric value of the TimeDelta object. Please don't
   // use this and do arithmetic on it, as it is more error prone than using the
   // provided operators.
   int64 ToInternalValue() const {
     return delta_;
   }
 
   // Returns the time delta in some unit. The F versions return a floating
   // point value, the "regular" versions return a rounded-down value.
+  //
+  // InMillisecondsRoundedUp() instead returns an integer that is rounded up
+  // to the next full millisecond.
   int InDays() const;
   int InHours() const;
   int InMinutes() const;
   double InSecondsF() const;
   int64 InSeconds() const;
   double InMillisecondsF() const;
   int64 InMilliseconds() const;
+  int64 InMillisecondsRoundedUp() const;
   int64 InMicroseconds() const;
 
   TimeDelta& operator=(TimeDelta other) {
     delta_ = other.delta_;
     return *this;
   }
 
   // Computations with other deltas.
   TimeDelta operator+(TimeDelta other) const {
     return TimeDelta(delta_ + other.delta_);
@@ skipping 407 matching lines @@
 #endif
 };
 
 inline TimeTicks TimeDelta::operator+(TimeTicks t) const {
   return TimeTicks(t.ticks_ + delta_);
 }
 
 }  // namespace base
 
 #endif  // BASE_TIME_H_