Added the Ash.Tab.TimeBetweenSwitchToExistingTabUserActions histogram to track time between tab swit

ash/metrics/user_metrics_recorder.h

 // Copyright 2013 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 ASH_METRICS_USER_METRICS_RECORDER_H_
 #define ASH_METRICS_USER_METRICS_RECORDER_H_
 
 #include "ash/ash_export.h"
 #include "ash/metrics/task_switch_metrics_recorder.h"
+#include "base/memory/scoped_ptr.h"

[tdanderson, 2015/05/15 19:23:09]

needed?

[bruthig, 2015/05/15 19:36:21]

Done.

 #include "base/timer/timer.h"
 
 namespace ash {
 
+class ShellDelegate;

[Alexei Svitkine (slow), 2015/05/15 19:19:56]

Do you still need changes to this file?

[tdanderson, 2015/05/15 19:23:09]

needed?

[bruthig, 2015/05/15 19:36:21]

Done.

[bruthig, 2015/05/15 19:36:21]

Nope, done.

+
 namespace test {
 class UserMetricsRecorderTestAPI;
 }
 
 enum UserMetricsAction {
   UMA_ACCEL_EXIT_FIRST_Q,
   UMA_ACCEL_EXIT_SECOND_Q,
   UMA_ACCEL_KEYBOARD_BRIGHTNESS_DOWN_F6,
   UMA_ACCEL_KEYBOARD_BRIGHTNESS_UP_F7,
   UMA_ACCEL_LOCK_SCREEN_LOCK_BUTTON,
@@ skipping 154 matching lines @@
   base::RepeatingTimer<UserMetricsRecorder> timer_;
 
   TaskSwitchMetricsRecorder task_switch_metrics_recorder_;
 
   DISALLOW_COPY_AND_ASSIGN(UserMetricsRecorder);
 };
 
 }  // namespace ash
 
 #endif  // ASH_METRICS_USER_METRICS_RECORDER_H_