diff --git a/base/message_loop/message_loop.h b/base/message_loop/message_loop.h
index 165299d..22d4f73 100644
--- a/base/message_loop/message_loop.h
+++ b/base/message_loop/message_loop.h
@@ -18,6 +18,7 @@
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/message_loop/message_loop_proxy_impl.h"
 #include "base/message_loop/message_pump.h"
+#include "base/message_loop/timer_slack.h"
 #include "base/observer_list.h"
 #include "base/pending_task.h"
 #include "base/sequenced_task_runner_helpers.h"
@@ -274,6 +275,11 @@
   // arbitrary MessageLoop to QuitWhenIdle.
   static Closure QuitWhenIdleClosure();
 
+  // Set the timer slack for this message loop.
+  void SetTimerSlack(TimerSlack timer_slack) {
+    pump_->SetTimerSlack(timer_slack);
+  }
+
   // Returns true if this loop is |type|. This allows subclasses (especially
   // those in tests) to specialize how they are identified.
   virtual bool IsType(Type type) const;
diff --git a/base/message_loop/message_pump.cc b/base/message_loop/message_pump.cc
index 7ffc2b1..3d85b9b 100644
--- a/base/message_loop/message_pump.cc
+++ b/base/message_loop/message_pump.cc
@@ -12,4 +12,7 @@
 MessagePump::~MessagePump() {
 }
 
+void MessagePump::SetTimerSlack(TimerSlack) {
+}
+
 }  // namespace base
diff --git a/base/message_loop/message_pump.h b/base/message_loop/message_pump.h
index 816bb3c..a795f31 100644
--- a/base/message_loop/message_pump.h
+++ b/base/message_loop/message_pump.h
@@ -7,6 +7,7 @@
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
+#include "base/message_loop/timer_slack.h"
 #include "base/threading/non_thread_safe.h"
 
 namespace base {
@@ -134,6 +135,9 @@
   // cancelling any pending DoDelayedWork callback.  This method may only be
   // used on the thread that called Run.
   virtual void ScheduleDelayedWork(const TimeTicks& delayed_work_time) = 0;
+
+  // Sets the timer slack to the specified value.
+  virtual void SetTimerSlack(TimerSlack timer_slack);
 };
 
 }  // namespace base
diff --git a/base/message_loop/timer_slack.h b/base/message_loop/timer_slack.h
new file mode 100644
index 0000000..1ad6ca9
--- /dev/null
+++ b/base/message_loop/timer_slack.h
@@ -0,0 +1,22 @@
+// Copyright 2014 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.
+
+#ifndef BASE_MESSAGE_LOOP_TIMER_SLACK_H_
+#define BASE_MESSAGE_LOOP_TIMER_SLACK_H_
+
+namespace base {
+
+// Amount of timer slack to use for delayed timers.  Increasing timer slack
+// allows the OS to coalesce timers more effectively.
+enum TimerSlack {
+  // Lowest value for timer slack allowed by OS.
+  TIMER_SLACK_NONE,
+
+  // Maximal value for timer slack allowed by OS.
+  TIMER_SLACK_MAXIMUM
+};
+
+}  // namespace base
+
+#endif  // BASE_MESSAGE_LOOP_TIMER_SLACK_H_