Adding UMA for data reduction proxy page load size/savings

chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h

 // 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.
 
 #ifndef CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_DATA_REDUCTION_PROXY_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_DATA_REDUCTION_PROXY_METRICS_OBSERVER_H_
 
+#include <stdint.h>
+
 #include <memory>
 
 #include "base/macros.h"
 #include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
 
 namespace content {
 class BrowserContext;
 class NavigationHandle;
 }
 
@@ skipping 16 matching lines @@
 extern const char kHistogramLoadEventFiredSuffix[];
 extern const char kHistogramFirstContentfulPaintSuffix[];
 extern const char kHistogramFirstMeaningfulPaintSuffix[];
 extern const char kHistogramFirstImagePaintSuffix[];
 extern const char kHistogramFirstPaintSuffix[];
 extern const char kHistogramFirstTextPaintSuffix[];
 extern const char kHistogramParseStartSuffix[];
 extern const char kHistogramParseBlockedOnScriptLoadSuffix[];
 extern const char kHistogramParseDurationSuffix[];
 
+// Byte and request specific histogram suffixes.
+extern const char kRequestsPercentProxied[];
+extern const char kBytesPercentProxied[];
+extern const char kBytesCompressionRatio[];
+extern const char kBytesInflationPercent[];
+extern const char kNetworkRequests[];
+extern const char kRequestsProxied[];
+extern const char kRequestsNotProxied[];
+extern const char kNetworkBytes[];
+extern const char kBytesProxied[];
+extern const char kBytesNotProxied[];
+extern const char kBytesOriginal[];
+extern const char kBytesSavings[];
+extern const char kBytesInflation[];
+
 }  // namespace internal
 
 // Observer responsible for recording core page load metrics releveant to
 // DataReductionProxy.
 class DataReductionProxyMetricsObserver
     : public page_load_metrics::PageLoadMetricsObserver {
  public:
   DataReductionProxyMetricsObserver();
   ~DataReductionProxyMetricsObserver() override;
 
@@ skipping 29 matching lines @@
   void OnFirstContentfulPaint(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnFirstMeaningfulPaint(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnParseStart(const page_load_metrics::PageLoadTiming& timing,
                     const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnParseStop(const page_load_metrics::PageLoadTiming& timing,
                    const page_load_metrics::PageLoadExtraInfo& info) override;
+  void OnLoadedResource(
+      const page_load_metrics::ExtraRequestInfo& extra_request_info) override;
 
  private:
   // Sends the page load information to the pingback client.
   void SendPingback(const page_load_metrics::PageLoadTiming& timing,
                     const page_load_metrics::PageLoadExtraInfo& info);
 
+  // Records UMA of page size when the observer is about to be deleted.
+  void RecordPageSizeUMA() const;
+
   // Gets the default DataReductionProxyPingbackClient. Overridden in testing.
   virtual DataReductionProxyPingbackClient* GetPingbackClient() const;
 
   // Data related to this navigation.
   std::unique_ptr<DataReductionProxyData> data_;
 
   // The browser context this navigation is operating in.
   content::BrowserContext* browser_context_;
 
+  // The number of requests that used data reduction proxy.
+  int num_data_reduction_proxy_requests_;
+
+  // The number of request that did not come from cache.
+  int num_network_requests_;
+
+  // The total content network bytes that the user would have downloaded if they
+  // were not using data reduction proxy.
+  int64_t original_network_bytes_;
+
+  // The total network bytes loaded through data reduction proxy.
+  int64_t network_bytes_proxied_;
+
+  // The total network bytes used.
+  int64_t network_bytes_;
+
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyMetricsObserver);
 };
 
 }  // namespace data_reduction_proxy
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_DATA_REDUCTION_PROXY_METRICS_OBSERVER_H_