[Win] Add a fast profile switcher to the Windows taskbar item.

chrome/browser/metrics/jumplist_metrics_win.cc

+// 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.
+
+#include "chrome/browser/metrics/jumplist_metrics_win.h"
+
+#include "base/metrics/histogram.h"
+
+namespace jumplist {
+
+const char kMostVisitedCategory[] = "most-visited";
+const char kProfilesCategory[] = "profiles";
+const char kRecentlyClosedCategory[] = "recently-closed";
+
+void LogJumplistActionFromSwitchValue(const std::string& value) {
+  JumplistCategory metric = CATEGORY_UNKNOWN;
+  if (value == kMostVisitedCategory)
+    metric = MOST_VISITED_URL;
+  else if (value == kProfilesCategory)
+    metric = SWITCH_TO_PROFILE;
+  else if (value == kRecentlyClosedCategory)
+    metric = RECENTLY_CLOSED_URL;
+  DCHECK_NE(metric, CATEGORY_UNKNOWN);
+
+  UMA_HISTOGRAM_ENUMERATION(
+      "WinJumplist.Action", metric, NUM_JUMPLIST_CATEGORY_METRICS);
+}
+
+}  // namespace jumplist