Showing Gloweffect correctly during fling on mainthread.

content/renderer/render_widget.cc

 // Copyright (c) 2012 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 "content/renderer/render_widget.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 148 matching lines @@
 // the BeginMainFrame interval.
 // 4166us will allow 1/4 of a 60Hz interval or 1/2 of a 120Hz interval to
 // be spent in input hanlders before input starts getting throttled.
 const int kInputHandlingTimeThrottlingThresholdMicroseconds = 4166;
 
 int64 GetEventLatencyMicros(const WebInputEvent& event, base::TimeTicks now) {
   return (now - base::TimeDelta::FromSecondsD(event.timeStampSeconds))
       .ToInternalValue();
 }
 
+// TODO(sataya.m): Remove this api once http://crbug.com/499743 is fixed.
+gfx::Vector2dF ToClientScrollIncrement(const blink::WebFloatSize& increment) {

[jdduke (slow), 2015/06/12 14:53:16]

Let's just inline this function and the comment, I don't think we want it to be
used by code other than overscroll.

[MuVen, 2015/06/12 15:08:04]

Done.

+  return gfx::Vector2dF(-increment.width, -increment.height);
+}
+
 void LogInputEventLatencyUma(const WebInputEvent& event, base::TimeTicks now) {
   UMA_HISTOGRAM_CUSTOM_COUNTS(
       "Event.AggregatedLatency.Renderer2",
       GetEventLatencyMicros(event, now),
       1,
       10000000,
       100);
 
 #define CASE_TYPE(t) \
     case WebInputEvent::t: \
@@ skipping 2042 matching lines @@
     const blink::WebFloatSize& accumulatedRootOverScroll,
     const blink::WebFloatPoint& position,
     const blink::WebFloatSize& velocity) {
   DidOverscrollParams params;
   // TODO(jdduke): Consider bundling the overscroll with the input event ack to
   // save an IPC.
   params.accumulated_overscroll = gfx::Vector2dF(
       accumulatedRootOverScroll.width, accumulatedRootOverScroll.height);
   params.latest_overscroll_delta =
       gfx::Vector2dF(unusedDelta.width, unusedDelta.height);
-  params.current_fling_velocity =
-      gfx::Vector2dF(velocity.width, velocity.height);
+  params.current_fling_velocity = ToClientScrollIncrement(velocity);
   params.causal_event_viewport_point = gfx::PointF(position.x, position.y);
   Send(new InputHostMsg_DidOverscroll(routing_id_, params));
 }
 
 void RenderWidget::StartCompositor() {
   // For widgets that are never visible, we don't need the compositor to run
   // at all.
   if (never_visible_)
     return;
   // In tests without a RenderThreadImpl, don't set ready as this kicks
@@ skipping 211 matching lines @@
 void RenderWidget::RegisterVideoHoleFrame(RenderFrameImpl* frame) {
   video_hole_frames_.AddObserver(frame);
 }
 
 void RenderWidget::UnregisterVideoHoleFrame(RenderFrameImpl* frame) {
   video_hole_frames_.RemoveObserver(frame);
 }
 #endif  // defined(VIDEO_HOLE)
 
 }  // namespace content