Relands: Telemetry: hooks "chrome.gpuBenchmarking.smoothScrollBy" with java on android.

content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture.cc

Index: content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture.cc
diff --git a/content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture.cc b/content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture.cc
index b4eaa497fd7a97abd8588e0b7f1e43a23e2e668c..1bcc8223e97e1c78a74d4e34f8ddf56838a01b44 100644
--- a/content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture.cc
+++ b/content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture.cc
@@ -26,17 +26,10 @@ bool BasicMouseWheelSmoothScrollGesture::ForwardInputEvents(
   if (pixels_scrolled_ >= pixels_to_scroll_)
     return false;
 
-  double position_delta = 10;
-  if (!last_tick_time_.is_null()) {
-    RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(host);
-    base::TimeDelta desired_interval =
-        rwhi->GetSyntheticScrollMessageInterval();
-    double velocity = 10 / desired_interval.InMillisecondsF();
-    double time_delta = (now - last_tick_time_).InMillisecondsF();
-    position_delta = velocity * time_delta;
-  }
-
-  last_tick_time_ = now;
+  double position_delta = smooth_scroll_calculator_.GetScrollDelta(
+      now,
+      RenderWidgetHostImpl::From(host)->GetSyntheticScrollMessageInterval());
+
 
   WebKit::WebMouseWheelEvent event;
   event.type = WebKit::WebInputEvent::MouseWheel;