ServiceWorker: Add UMA for ServiceWorkerDiskCache

content/browser/service_worker/service_worker_histograms.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 "content/browser/service_worker/service_worker_histograms.h"
+
+#include "base/metrics/histogram.h"
+
+namespace content {
+
+// static
+void ServiceWorkerHistograms::CountInitDiskCacheResult(bool result) {
+  UMA_HISTOGRAM_BOOLEAN("ServiceWorker.DiskCache.InitResult", result);
+}
+
+// static
+void ServiceWorkerHistograms::CountReadResponseResult(
+    ServiceWorkerHistograms::ReadResponseResult result) {
+  UMA_HISTOGRAM_ENUMERATION("ServiceWorker.DiskCache.ReadResponseResult",
+                            result, NUM_READ_RESPONSE_RESULT_TYPES);
+}
+
+// static
+void ServiceWorkerHistograms::CountWriteResponseResult(
+    ServiceWorkerHistograms::WriteResponseResult result) {
+  UMA_HISTOGRAM_ENUMERATION("ServiceWorker.DiskCache.WriteResponseResult",
+                            result, NUM_WRITE_RESPONSE_RESULT_TYPES);
+}
+
+}  // namespace content