blob: c0bd5aac0a5062cea92257f3a3d2295b48c610c6 [file] [log] [blame]
// 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.
#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 {
~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);
explicit BrowserWindowHistogramHelper(ui::Compositor* compositor);
// ui::CompositorObserver:
void OnCompositingEnded(ui::Compositor* compositor) override;
void OnCompositingShuttingDown(ui::Compositor* compositor) override;
ScopedObserver<ui::Compositor, ui::CompositorObserver> scoped_observer_;