Remove a frame of delay on main-thread FlingStart. [2nd land]

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index 25ac5094e6346d6e8c8e380599cbe1ed867760e5..af6fb0283faa530728c37dd6d32af7854501c222 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -698,8 +698,8 @@ WebInputEventResult WebViewImpl::HandleGestureEvent(
                             event.data.fling_start.velocity_y),
               WebSize());
       DCHECK(fling_curve);
-      gesture_animation_ = WebActiveGestureAnimation::CreateAtAnimationStart(
-          std::move(fling_curve), this);
+      gesture_animation_ = WebActiveGestureAnimation::CreateWithTimeOffset(
+          std::move(fling_curve), this, event.TimeStampSeconds());
       MainFrameImpl()->FrameWidget()->ScheduleAnimation();
       event_result = WebInputEventResult::kHandledSystem;