Add UMA histograms for policy loading.

chrome/browser/policy/policy_load_status.cc

+// Copyright (c) 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 "chrome/browser/policy/policy_load_status.h"
+
+#include "base/metrics/histogram.h"
+#include "base/stringprintf.h"
+#include "chrome/browser/policy/policy_types.h"
+
+namespace policy {
+
+namespace {
+
+const char kHistogramName[] = "Enterprise.PolicyLoadStatus";
+
+}  // namespace
+
+PolicyLoadStatusSample::PolicyLoadStatusSample()
+    : histogram_(base::LinearHistogram::FactoryGet(
+          kHistogramName, 1, POLICY_LOAD_STATUS_SIZE,
+          POLICY_LOAD_STATUS_SIZE + 1,
+          base::Histogram::kUmaTargetedHistogramFlag)) {
+  Add(POLICY_LOAD_STATUS_STARTED);
+}
+
+PolicyLoadStatusSample::~PolicyLoadStatusSample() {
+  for (int i = 0; i < POLICY_LOAD_STATUS_SIZE; ++i) {
+    if (status_bits_[i])
+      histogram_->Add(i);
+  }
+}
+
+void PolicyLoadStatusSample::Add(PolicyLoadStatus status) {
+  status_bits_[status] = true;
+}
+
+}  // namespace policy