Changed previews component to be a layered component.

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_->UpdateDataSavings(fully_qualified_domain_name,
-                                                 data_used, original_size)) {
-    // Record metrics in KB for previews with data saver disabled.
-    UMA_HISTOGRAM_COUNTS("Previews.OriginalContentLength.DataSaverDisabled",
-                         original_size >> 10);
-    UMA_HISTOGRAM_COUNTS("Previews.ContentLength.DataSaverDisabled",
-                         data_used >> 10);
-    if (original_size >= data_used) {
-      UMA_HISTOGRAM_COUNTS("Previews.DataSavings.DataSaverDisabled",
-                           (original_size - data_used) >> 10);
-      UMA_HISTOGRAM_PERCENTAGE(
-          "Previews.DataSavingsPercent.DataSaverDisabled",
-          (original_size - data_used) * 100 / original_size);
-    } else {
-      UMA_HISTOGRAM_COUNTS("Previews.DataInflation.DataSaverDisabled",
-                           (data_used - original_size) >> 10);
-      UMA_HISTOGRAM_PERCENTAGE(
-          "Previews.DataInflationPercent.DataSaverDisabled",
-          (data_used - original_size) * 100 / data_used);
-    }
-    return;
-  }
-
-  // Record metrics in KB for previews with data saver enabled.
-  UMA_HISTOGRAM_COUNTS("Previews.OriginalContentLength.DataSaverEnabled",
-                       original_size >> 10);
-  UMA_HISTOGRAM_COUNTS("Previews.ContentLength.DataSaverEnabled",
-                       data_used >> 10);
-  if (original_size >= data_used) {
-    UMA_HISTOGRAM_COUNTS("Previews.DataSavings.DataSaverEnabled",
-                         (original_size - data_used) >> 10);
-    UMA_HISTOGRAM_PERCENTAGE("Previews.DataSavingsPercent.DataSaverEnabled",
-                             (original_size - data_used) * 100 / original_size);
-  } else {
-    UMA_HISTOGRAM_COUNTS("Previews.DataInflation.DataSaverEnabled",
-                         (data_used - original_size) >> 10);
-    UMA_HISTOGRAM_PERCENTAGE("Previews.DataInflationPercent.DataSaverEnabled",
-                             (data_used - original_size) * 100 / data_used);
-  }
-}
-
-}  // namespace previews