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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 #include "base/bind.h" |
| 6 #include "base/message_loop/message_loop.h" |
| 7 #include "base/run_loop.h" |
| 8 #include "base/test/histogram_tester.h" |
| 9 #include "content/browser/renderer_host/input/synthetic_gesture.h" |
| 10 #include "content/browser/renderer_host/input/synthetic_gesture_controller.h" |
| 11 #include "content/browser/renderer_host/input/synthetic_gesture_target.h" |
| 12 #include "content/browser/renderer_host/input/synthetic_smooth_scroll_gesture.h" |
| 13 #include "content/browser/renderer_host/render_widget_host_impl.h" |
| 14 #include "content/browser/web_contents/web_contents_impl.h" |
| 15 #include "content/common/input/synthetic_gesture_params.h" |
| 16 #include "content/common/input/synthetic_smooth_scroll_gesture_params.h" |
| 17 #include "content/public/browser/render_view_host.h" |
| 18 #include "content/public/browser/render_widget_host_view.h" |
| 19 #include "content/public/test/browser_test_utils.h" |
| 20 #include "content/public/test/content_browser_test.h" |
| 21 #include "content/public/test/content_browser_test_utils.h" |
| 22 #include "content/shell/browser/shell.h" |
| 23 |
| 24 namespace { |
| 25 |
| 26 const char kDataURL[] = |
| 27 "data:text/html;charset=utf-8," |
| 28 "<!DOCTYPE html>" |
| 29 "<html>" |
| 30 "<head>" |
| 31 "<title>Mouse wheel latency histograms reported.</title>" |
| 32 "<script src=\"../../resources/testharness.js\"></script>" |
| 33 "<script src=\"../../resources/testharnessreport.js\"></script>" |
| 34 "<style>" |
| 35 "body {" |
| 36 " height:3000px;" |
| 37 "}" |
| 38 "</style>" |
| 39 "</head>" |
| 40 "<body>" |
| 41 "</body>" |
| 42 "</html>"; |
| 43 |
| 44 } // namespace |
| 45 |
| 46 namespace content { |
| 47 |
| 48 class ScrollLatencyBrowserTest : public ContentBrowserTest { |
| 49 public: |
| 50 ScrollLatencyBrowserTest() : loop_(base::MessageLoop::TYPE_UI) {} |
| 51 ~ScrollLatencyBrowserTest() override {} |
| 52 |
| 53 RenderWidgetHostImpl* GetWidgetHost() { |
| 54 return RenderWidgetHostImpl::From( |
| 55 shell()->web_contents()->GetRenderViewHost()->GetWidget()); |
| 56 } |
| 57 |
| 58 // TODO(tdresser): Find a way to avoid sleeping like this. See |
| 59 // crbug.com/405282 for details. |
| 60 void GiveItSomeTime() { |
| 61 base::RunLoop run_loop; |
| 62 base::ThreadTaskRunnerHandle::Get()->PostDelayedTask( |
| 63 FROM_HERE, run_loop.QuitClosure(), |
| 64 base::TimeDelta::FromMillisecondsD(10)); |
| 65 run_loop.Run(); |
| 66 } |
| 67 |
| 68 void WaitAFrame() { |
| 69 while (!GetWidgetHost()->ScheduleComposite()) |
| 70 GiveItSomeTime(); |
| 71 frame_watcher_.WaitFrames(1); |
| 72 } |
| 73 |
| 74 protected: |
| 75 void LoadURL() { |
| 76 const GURL data_url(kDataURL); |
| 77 NavigateToURL(shell(), data_url); |
| 78 |
| 79 RenderWidgetHostImpl* host = GetWidgetHost(); |
| 80 host->GetView()->SetSize(gfx::Size(400, 400)); |
| 81 |
| 82 frame_watcher_.Observe(shell()->web_contents()); |
| 83 |
| 84 // Wait a frame to make sure the page has renderered. |
| 85 WaitAFrame(); |
| 86 } |
| 87 |
| 88 // Generate a single wheel tick, scrolling by |distance|. This will perform a |
| 89 // smooth scroll on platforms which support it. |
| 90 void DoSmoothWheelScroll(const gfx::Vector2d& distance) { |
| 91 blink::WebGestureEvent event = |
| 92 SyntheticWebGestureEventBuilder::BuildScrollBegin( |
| 93 distance.x(), -distance.y(), |
| 94 blink::WebGestureDevice::kWebGestureDeviceTouchpad, 1); |
| 95 event.data.scroll_begin.delta_hint_units = |
| 96 blink::WebGestureEvent::ScrollUnits::kPixels; |
| 97 GetWidgetHost()->ForwardGestureEvent(event); |
| 98 |
| 99 blink::WebGestureEvent event2 = |
| 100 SyntheticWebGestureEventBuilder::BuildScrollUpdate( |
| 101 distance.x(), -distance.y(), 0, |
| 102 blink::WebGestureDevice::kWebGestureDeviceTouchpad); |
| 103 event2.data.scroll_update.delta_units = |
| 104 blink::WebGestureEvent::ScrollUnits::kPixels; |
| 105 GetWidgetHost()->ForwardGestureEvent(event2); |
| 106 } |
| 107 |
| 108 private: |
| 109 base::MessageLoop loop_; |
| 110 base::RunLoop runner_; |
| 111 FrameWatcher frame_watcher_; |
| 112 |
| 113 DISALLOW_COPY_AND_ASSIGN(ScrollLatencyBrowserTest); |
| 114 }; |
| 115 |
| 116 // Perform a smooth wheel scroll, and verify that our end-to-end wheel latency |
| 117 // metric is recorded. See crbug.com/599910 for details. |
| 118 IN_PROC_BROWSER_TEST_F(ScrollLatencyBrowserTest, SmoothWheelScroll) { |
| 119 LoadURL(); |
| 120 |
| 121 base::HistogramTester histogram_tester; |
| 122 DoSmoothWheelScroll(gfx::Vector2d(0, 100)); |
| 123 |
| 124 size_t num_samples = 0; |
| 125 |
| 126 while (num_samples == 0) { |
| 127 num_samples = |
| 128 histogram_tester |
| 129 .GetAllSamples( |
| 130 "Event.Latency.ScrollBegin.Wheel.TimeToScrollUpdateSwapBegin2") |
| 131 .size(); |
| 132 GiveItSomeTime(); |
| 133 } |
| 134 } |
| 135 |
| 136 } // namespace content |
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Chromium Code Reviews
Issue 2863103002:
Reduce composited smooth scroll latency by a frame (also fixes latency UMAs). (Closed)
