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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef UI_LATENCY_LATENCY_TRACKER_H_ |
| 6 #define UI_LATENCY_LATENCY_TRACKER_H_ |
| 7 |
| 8 #include "base/macros.h" |
| 9 #include "ui/latency/latency_info.h" |
| 10 |
| 11 namespace ui { |
| 12 |
| 13 // Utility class for tracking the latency of events. Relies on LatencyInfo |
| 14 // components logged by content::RenderWidgetHostLatencyTracker. |
| 15 class LatencyTracker { |
| 16 public: |
| 17 LatencyTracker() = default; |
| 18 ~LatencyTracker() = default; |
| 19 |
| 20 // Terminates latency tracking for events that triggered rendering, also |
| 21 // performing relevant UMA latency reporting. |
| 22 // Called when GPU buffers swap completes. |
| 23 void OnGpuSwapBuffersCompleted(const LatencyInfo& latency); |
| 24 |
| 25 protected: |
| 26 virtual void ReportRapporScrollLatency( |
| 27 const std::string& name, |
| 28 const LatencyInfo::LatencyComponent& start_component, |
| 29 const LatencyInfo::LatencyComponent& end_component); |
| 30 |
| 31 private: |
| 32 void ComputeTouchAndWheelScrollLatencyHistograms( |
| 33 const LatencyInfo::LatencyComponent& gpu_swap_begin_component, |
| 34 const LatencyInfo::LatencyComponent& gpu_swap_end_component, |
| 35 const LatencyInfo& latency); |
| 36 |
| 37 DISALLOW_COPY_AND_ASSIGN(LatencyTracker); |
| 38 }; |
| 39 |
| 40 } // namespace latency |
| 41 |
| 42 #endif // UI_LATENCY_LATENCY_TRACKER_H_ |
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