Update from https://crrev.com/316786

base/time/time.h

 // Copyright (c) 2012 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 coordinated universal time (UTC),
 // internally represented as microseconds (s/1,000,000) since the Windows epoch
 // (1601-01-01 00:00:00 UTC) (See http://crbug.com/14734).  System-dependent
 // clock interface routines are defined in time_PLATFORM.cc.
 //
 // TimeDelta represents a duration of time, internally represented in
@@ skipping 662 matching lines @@
   // value for the duration of the application, but will be different in future
   // application runs.
   static TimeTicks UnixEpoch();
 
   // Returns the internal numeric value of the TimeTicks object.
   // For serializing, use FromInternalValue to reconstitute.
   int64 ToInternalValue() const {
     return ticks_;
   }
 
+  // Returns |this| snapped to the next tick, given a |tick_phase| and
+  // repeating |tick_interval| in both directions. |this| may be before,
+  // after, or equal to the |tick_phase|.
+  TimeTicks SnappedToNextTick(TimeTicks tick_phase,
+                              TimeDelta tick_interval) const;
+
   TimeTicks& operator=(TimeTicks other) {
     ticks_ = other.ticks_;
     return *this;
   }
 
   // Compute the difference between two times.
   TimeDelta operator-(TimeTicks other) const {
     return TimeDelta(ticks_ - other.ticks_);
   }
 
@@ skipping 55 matching lines @@
 inline TimeTicks TimeDelta::operator+(TimeTicks t) const {
   return TimeTicks(t.ticks_ + delta_);
 }
 
 // For logging use only.
 BASE_EXPORT std::ostream& operator<<(std::ostream& os, TimeTicks time_ticks);
 
 }  // namespace base
 
 #endif  // BASE_TIME_TIME_H_