| // 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_METRICS_BROWSER_WINDOW_HISTOGRAM_HELPER_H_ |
| #define CHROME_BROWSER_METRICS_BROWSER_WINDOW_HISTOGRAM_HELPER_H_ |
| |
| #include <memory> |
| |
| #include "base/macros.h" |
| #include "base/scoped_observer.h" |
| #include "base/time/time.h" |
| #include "ui/compositor/compositor_observer.h" |
| |
| // Class that encapsulates logic of recording |
| // Startup.BrowserWindow.FirstPaint* histograms. |
| // |
| // There's a dependency on ui/compositor therefore it can't be moved to |
| // components/startup_metrics_utils. |
| class BrowserWindowHistogramHelper : public ui::CompositorObserver { |
| public: |
| ~BrowserWindowHistogramHelper() override; |
| |
| // Call this when the Browser finishes painting its UI, and the user will see |
| // it after next Compositor frame swap. |
| // |compositor| is the compositor that composites the just-painted Browser |
| // widget, or nullptr in Cocoa (we're using CoreAnimation's compositor there). |
| // Returned object should stay alive until next |OnCompositingStarted| |
| // callback. |
| static std::unique_ptr<BrowserWindowHistogramHelper> |
| MaybeRecordValueAndCreateInstanceOnBrowserPaint(ui::Compositor* compositor); |
| |
| private: |
| explicit BrowserWindowHistogramHelper(ui::Compositor* compositor); |
| |
| // ui::CompositorObserver: |
| void OnCompositingDidCommit(ui::Compositor* compositor) override {} |
| void OnCompositingStarted(ui::Compositor* compositor, |
| base::TimeTicks start_time) override {} |
| void OnCompositingEnded(ui::Compositor* compositor) override; |
| void OnCompositingChildResizing(ui::Compositor* compositor) override {} |
| void OnCompositingShuttingDown(ui::Compositor* compositor) override; |
| |
| ScopedObserver<ui::Compositor, ui::CompositorObserver> scoped_observer_; |
| |
| DISALLOW_COPY_AND_ASSIGN(BrowserWindowHistogramHelper); |
| }; |
| |
| #endif // CHROME_BROWSER_METRICS_BROWSER_WINDOW_HISTOGRAM_HELPER_H_ |