Add subresource filter page load metrics observer

chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.h b/chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..27b01286fab6c1c4f087a7f6cc633df3f192fd58
--- /dev/null
+++ b/chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.h
@@ -0,0 +1,76 @@
+// Copyright 2017 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_SUBRESOURCE_FILTER_METRICS_OBSERVER_H_
+#define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_SUBRESOURCE_FILTER_METRICS_OBSERVER_H_
+
+#include "base/macros.h"
+#include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
+
+namespace internal {
+
+extern const char kHistogramSubresourceFilterFirstContentfulPaint[];
+extern const char kHistogramSubresourceFilterParseStartToFirstContentfulPaint[];
+extern const char kHistogramSubresourceFilterFirstMeaningfulPaint[];
+extern const char kHistogramSubresourceFilterParseStartToFirstMeaningfulPaint[];
+
+extern const char kHistogramSubresourceFilterTotalResources[];
+extern const char kHistogramSubresourceFilterNetworkResources[];
+extern const char kHistogramSubresourceFilterCacheResources[];
+extern const char kHistogramSubresourceFilterTotalBytes[];
+extern const char kHistogramSubresourceFilterNetworkBytes[];
+extern const char kHistogramSubresourceFilterCacheBytes[];
+
+extern const char kHistogramSubresourceFilterDomContentLoaded[];
+extern const char kHistogramSubresourceFilterLoad[];
+
+extern const char kHistogramSubresourceFilterCount[];
+
+}  // namespace internal
+
+class SubresourceFilterMetricsObserver
+    : public page_load_metrics::PageLoadMetricsObserver {
+ public:
+  SubresourceFilterMetricsObserver() = default;
+  ~SubresourceFilterMetricsObserver() override = default;
+
+  // page_load_metrics::PageLoadMetricsObserver:
+  ObservePolicy FlushMetricsOnAppEnterBackground(
+      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::PageLoadExtraInfo& info) override;
+  void OnComplete(const page_load_metrics::PageLoadTiming& timing,
+                  const page_load_metrics::PageLoadExtraInfo& info) override;
+  void OnLoadedResource(
+      const page_load_metrics::ExtraRequestInfo& extra_request_info) override;
+  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 OnDomContentLoadedEventStart(
+      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::PageLoadExtraInfo& extra_info) override;
+  void OnLoadEventStart(
+      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::PageLoadExtraInfo& extra_info) override;
+  void OnLoadingBehaviorObserved(
+      const page_load_metrics::PageLoadExtraInfo& extra_info) override;
+
+ private:
+  void OnGoingAway(const page_load_metrics::PageLoadTiming& timing,
+                   const page_load_metrics::PageLoadExtraInfo& info);
+
+  int64_t network_bytes_ = 0;
+  int64_t cache_bytes_ = 0;
+
+  int num_network_resources_ = 0;
+  int num_cache_resources_ = 0;
+
+  bool subresource_filter_observed_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(SubresourceFilterMetricsObserver);
+};
+
+#endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_SUBRESOURCE_FILTER_METRICS_OBSERVER_H_