| // 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_USE_COUNTER_PAGE_LOAD_METRICS_OBSERVER_H_ |
| #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_USE_COUNTER_PAGE_LOAD_METRICS_OBSERVER_H_ |
| |
| #include <bitset> |
| #include "base/logging.h" |
| #include "base/macros.h" |
| #include "chrome/browser/page_load_metrics/page_load_metrics_observer.h" |
| #include "third_party/WebKit/public/platform/web_feature.mojom.h" |
| |
| namespace internal { |
| |
| const char kFeaturesHistogramName[] = |
| "Blink.UseCounter.Features_TestBrowserProcessLogging"; |
| const char kUkmUseCounterEventName[] = "Blink.UseCounter"; |
| const char kUkmUseCounterFeature[] = "Feature"; |
| |
| } // namespace internal |
| |
| class UseCounterPageLoadMetricsObserver |
| : public page_load_metrics::PageLoadMetricsObserver { |
| public: |
| UseCounterPageLoadMetricsObserver(); |
| ~UseCounterPageLoadMetricsObserver() override; |
| |
| // page_load_metrics::PageLoadMetricsObserver. |
| ObservePolicy OnCommit(content::NavigationHandle* navigation_handle, |
| ukm::SourceId source_id) override; |
| void OnFeaturesUsageObserved( |
| const page_load_metrics::mojom::PageLoadFeatures&, |
| const page_load_metrics::PageLoadExtraInfo& extra_info) override; |
| |
| private: |
| // To keep tracks of which features have been measured. |
| std::bitset<static_cast<size_t>(blink::mojom::WebFeature::kNumberOfFeatures)> |
| features_recorded_; |
| DISALLOW_COPY_AND_ASSIGN(UseCounterPageLoadMetricsObserver); |
| }; |
| |
| #endif // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_USE_COUNTER_PAGE_LOAD_METRICS_OBSERVER_H_ |