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 {
+
+// Histogram Name constants.
+const char kHistogramName[] = "Enterprise.PolicyLoadStatus";
+const char kHistogramNameNone[] = "none";
+const char kHistogramNameScopeMachine[] = "machine";
+const char kHistogramNameScopeUser[] = "user";
+const char kHistogramNameLevelMandatory[] = "mandatory";
+const char kHistogramNameLevelRecommended[] = "recommended";
+
+// Gets the name of the histogram to send the sample to.
+std::string GetHistogramName(int scope, int level) {
+  const char* scope_name = kHistogramNameNone;
+  switch (scope) {
+    case POLICY_SCOPE_MACHINE:
+      scope_name = kHistogramNameScopeMachine;
+      break;
+    case POLICY_SCOPE_USER:
+      scope_name = kHistogramNameScopeUser;
+      break;
+  }
+
+  const char* level_name = kHistogramNameNone;
+  switch (level) {
+    case POLICY_LEVEL_MANDATORY:
+      level_name = kHistogramNameLevelMandatory;
+      break;
+    case POLICY_LEVEL_RECOMMENDED:
+      level_name = kHistogramNameLevelRecommended;
+      break;
+  }
+
+  return std::string(kHistogramName) + "_" + scope_name + "_" + level_name;
+}
+
+}

[Joao da Silva, 2013/04/16 17:31:04]

//  namespace

[Mattias Nissler (ping if slow), 2013/04/16 18:51:14]

Done.

+
+PolicyLoadStatusSample::PolicyLoadStatusSample(int scope, int level)
+  : histogram_(base::LinearHistogram::FactoryGet(
+        GetHistogramName(scope, level), 1, POLICY_LOAD_STATUS_SIZE,
+        POLICY_LOAD_STATUS_SIZE, base::Histogram::kUmaTargetedHistogramFlag)) {
+  Add(POLICY_LOAD_STATUS_STARTED);
+}
+
+void PolicyLoadStatusSample::Add(PolicyLoadStatus status) {
+  histogram_->Add(status);
+}
+
+}  // namespace policy