Log UMA metrics for multiprofile actions.

ash/multi_profile_uma.h

Index: ash/multi_profile_uma.h
diff --git a/ash/multi_profile_uma.h b/ash/multi_profile_uma.h
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+// 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_MULTI_PROFILE_UMA_H_
+#define ASH_MULTI_PROFILE_UMA_H_
+
+#include "ash/ash_export.h"
+#include "base/basictypes.h"
+
+namespace ash {
+
+// Records UMA statistics for multiprofile actions.
+// Note: There is also an action to switch profile windows from the
+// browser frame that is recorded by the "Profile.OpenMethod" metric.
+class ASH_EXPORT MultiProfileUMA {
+ public:
+  // Keep these enums up to date with tools/metrics/histograms/histograms.xml.
+  enum SwitchActiveUserAction {
+    SWITCH_ACTIVE_USER_BY_TRAY = 0,
+    SWITCH_ACTIVE_USER_BY_ACCELERATOR,
+    NUM_SWITCH_ACTIVE_USER_ACTIONS
+  };
+
+  enum SigninUserAction {
+    SIGNIN_USER_BY_TRAY = 0,
+    SIGNIN_USER_BY_BROWSER_FRAME,
+    NUM_SIGNIN_USER_ACTIONS
+  };
+
+  // Record switching the active user and what UI path was taken.
+  static void RecordSwitchActiveUser(SwitchActiveUserAction action);
+
+  // Record signing in a new user and what UI path was taken.
+  static void RecordSigninUser(SigninUserAction action);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(MultiProfileUMA);
+};
+
+}  // namespace ash
+
+#endif  // ASH_MULTI_PROFILE_UMA_H_