Log UMA metrics for multiprofile actions.

ash/multi_profile_uma.cc

Index: ash/multi_profile_uma.cc
diff --git a/ash/multi_profile_uma.cc b/ash/multi_profile_uma.cc
new file mode 100644
index 0000000000000000000000000000000000000000..328cccb9e3d5c669f3160912951b19caa24c5a73
--- /dev/null
+++ b/ash/multi_profile_uma.cc
@@ -0,0 +1,59 @@
+// 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.
+
+#include "ash/multi_profile_uma.h"
+
+#include "base/metrics/histogram.h"
+
+namespace {
+
+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
+};
+
+}  // namespace
+
+namespace ash {
+
+MultiProfileUMA::MultiProfileUMA() {}
+
+MultiProfileUMA::~MultiProfileUMA() {}
+
+// static
+void MultiProfileUMA::RecordSwitchUserFromTray() {
+  UMA_HISTOGRAM_ENUMERATION("MultiProfile.SwitchActiveUser",
+                            SWITCH_ACTIVE_USER_BY_TRAY,
+                            NUM_SWITCH_ACTIVE_USER_ACTIONS);
+}
+
+// static
+void MultiProfileUMA::RecordSwitchUserFromAccelerator() {
+  UMA_HISTOGRAM_ENUMERATION("MultiProfile.SwitchActiveUser",
+                            SWITCH_ACTIVE_USER_BY_ACCELERATOR,
+                            NUM_SWITCH_ACTIVE_USER_ACTIONS);

[Ilya Sherman, 2013/09/28 00:29:35]

Of lines 40-42, lines 40 and 42 are identical to the ones on lines 33-35.  This
means that it's easy for the code to drift, so that you update one
implementation but forget to update the other.  I'd strongly recommend having
just one UMA_HISTOGRAM_ENUMERATION macro per histogram name.

[Tim Song, 2013/09/28 01:35:13]

Done.

+}
+
+// static
+void MultiProfileUMA::RecordSigninUserFromTray() {
+  UMA_HISTOGRAM_ENUMERATION("MultiProfile.SigninUser",
+                            SIGNIN_USER_BY_TRAY,
+                            NUM_SIGNIN_USER_ACTIONS);
+}
+
+// static
+void MultiProfileUMA::RecordSigninUserFromBrowserFrame() {
+  UMA_HISTOGRAM_ENUMERATION("MultiProfile.SigninUser",
+                            SIGNIN_USER_BY_BROWSER_FRAME,
+                            NUM_SIGNIN_USER_ACTIONS);
+}
+
+}  // namespace ash