Animated scroll shouldn't consume unhandled scrolls for OOPIFs.

content/browser/renderer_host/input/input_router_impl.cc

Index: content/browser/renderer_host/input/input_router_impl.cc
diff --git a/content/browser/renderer_host/input/input_router_impl.cc b/content/browser/renderer_host/input/input_router_impl.cc
index 4f00ab21454f89b16da290c120eb65ed6f9dd71e..9c50a1e3ef317e7728d539912a2106740624e9b0 100644
--- a/content/browser/renderer_host/input/input_router_impl.cc
+++ b/content/browser/renderer_host/input/input_router_impl.cc
@@ -311,6 +311,11 @@ void InputRouterImpl::ForwardGestureEventWithLatencyInfo(
   client_->ForwardGestureEventWithLatencyInfo(event, latency_info);
 }
 
+bool InputRouterImpl::is_in_gesture_scroll() {
+  return client_->is_in_gesture_scroll(
+      blink::WebGestureDevice::kWebGestureDeviceTouchpad);
+}
+
 void InputRouterImpl::SendMouseWheelEventImmediately(
     const MouseWheelEventWithLatencyInfo& wheel_event) {
   FilterAndSendWebInputEvent(wheel_event.event, wheel_event.latency);