Adding a previews object, PreviewsDataSavings

components/previews/previews_data_savings.cc

+// Copyright 2016 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 "components/previews/previews_data_savings.h"
+
+#include "base/logging.h"
+#include "base/metrics/histogram_macros.h"
+#include "components/data_reduction_proxy/core/common/data_savings_recorder.h"
+
+namespace previews {
+
+PreviewsDataSavings::PreviewsDataSavings(
+    data_reduction_proxy::DataSavingsRecorder* data_savings_recorder)
+    : data_savings_recorder_(data_savings_recorder) {
+  DCHECK(data_savings_recorder);
+}
+
+PreviewsDataSavings::~PreviewsDataSavings() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
+
+void PreviewsDataSavings::RecordDataSavings(
+    const std::string& fully_qualified_domain_name,
+    int64_t data_used,
+    int64_t original_size) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  // Only record savings when data saver is enabled.
+  if (!data_savings_recorder_->ShouldRecordDataSavings()) {

[bengr, 2016/08/31 22:02:26]

Can this be an implementation detail of UpdateDataSavings?

[RyanSturm, 2016/09/02 01:17:51]

Done.

+    return;
+  }
+  data_savings_recorder_->UpdateDataSavings(fully_qualified_domain_name,
+                                            data_used, original_size);
+}
+
+}  // namespace previews