| // Copyright 2018 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_STALE_WHILE_REVALIDATE_PAGE_LOAD_METRICS_OBSERVER_H_ |
| #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_STALE_WHILE_REVALIDATE_PAGE_LOAD_METRICS_OBSERVER_H_ |
| |
| #include "base/macros.h" |
| #include "chrome/browser/page_load_metrics/page_load_metrics_observer.h" |
| |
| namespace internal { |
| |
| // Expose metrics for tests. |
| extern const char kHistogramSWRFirstContentfulPaintNetwork[]; |
| extern const char kHistogramSWRParseToFirstContentfulPaintNetwork[]; |
| extern const char kHistogramSWRFirstContentfulPaintStaleCache[]; |
| extern const char kHistogramSWRParseToFirstContentfulPaintStaleCache[]; |
| extern const char kHistogramSWRFirstContentfulPaintCache[]; |
| extern const char kHistogramSWRParseToFirstContentfulPaintCache[]; |
| |
| } // namespace internal |
| |
| class StaleWhileRevalidatePageLoadMetricsObserver |
| : public page_load_metrics::PageLoadMetricsObserver { |
| public: |
| StaleWhileRevalidatePageLoadMetricsObserver() = default; |
| |
| // page_load_metrics::PageLoadMetricsObserver implementation: |
| void OnFirstContentfulPaintInPage( |
| const page_load_metrics::mojom::PageLoadTiming& timing, |
| const page_load_metrics::PageLoadExtraInfo& extra_info) override; |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(StaleWhileRevalidatePageLoadMetricsObserver); |
| }; |
| |
| #endif // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_STALE_WHILE_REVALIDATE_PAGE_LOAD_METRICS_OBSERVER_H_ |