Added UMA stats to overview mode

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_USER_METRICS_RECORDER_H_
 #define ASH_USER_METRICS_RECORDER_H_
 
 #include "ash/ash_export.h"
 #include "base/timer/timer.h"
 
@@ skipping 82 matching lines @@
   UMA_TRAY_SHUT_DOWN,
   UMA_WINDOW_APP_CLOSE_BUTTON_CLICK,
   UMA_WINDOW_CLOSE_BUTTON_CLICK,
   UMA_WINDOW_MAXIMIZE_BUTTON_CLICK_EXIT_FULLSCREEN,
   UMA_WINDOW_MAXIMIZE_BUTTON_CLICK_MAXIMIZE,
   UMA_WINDOW_MAXIMIZE_BUTTON_CLICK_MINIMIZE,
   UMA_WINDOW_MAXIMIZE_BUTTON_CLICK_RESTORE,
   UMA_WINDOW_MAXIMIZE_BUTTON_MAXIMIZE_LEFT,
   UMA_WINDOW_MAXIMIZE_BUTTON_MAXIMIZE_RIGHT,
 
-  // Thumbnail sized overview of windows triggered. This is a subset of
-  // UMA_WINDOW_SELECTION triggered by lingering during alt+tab cycles or
-  // pressing the overview key.
+  // Thumbnail sized overview of windows triggered by pressing the overview key.
   UMA_WINDOW_OVERVIEW,
 
-  // Window selection started by beginning an alt+tab cycle or pressing the
-  // overview key. This does not count each step through an alt+tab cycle.
-  UMA_WINDOW_SELECTION,
+  // Selecting a window in overview mode by pressing the enter key.
+  UMA_WINDOW_OVERVIEW_ENTER_KEY,
+
+  // Window selection started by beginning an alt+tab cycle. This does not count
+  // each step through an alt+tab cycle.
+  UMA_WINDOW_CYCLE,
 };
 
 // User Metrics Recorder provides a repeating callback (RecordPeriodicMetrics)
 // on a timer to allow recording of state data over time to the UMA records.
 // Any additional states (in ash) that require monitoring can be added to
 // this class. As well calls to record on action metrics
 // (RecordUserMetricsAction) are passed through the UserMetricsRecorder.
 class ASH_EXPORT UserMetricsRecorder {
  public:
   UserMetricsRecorder();
   ~UserMetricsRecorder();
 
   void RecordUserMetricsAction(ash::UserMetricsAction action);
  private:
   void RecordPeriodicMetrics();
 
   base::RepeatingTimer<UserMetricsRecorder> timer_;
 };
 
 }  // namespace ash
 
 #endif  // ASH_USER_METRICS_RECORDER_H_