MouseWheelEventQueue should respect ScrollBegin/End state from RenderWidgetHost.

content/browser/renderer_host/render_widget_host_input_event_router.cc

Index: content/browser/renderer_host/render_widget_host_input_event_router.cc
diff --git a/content/browser/renderer_host/render_widget_host_input_event_router.cc b/content/browser/renderer_host/render_widget_host_input_event_router.cc
index f5553526d6c6834dbf18559dc4fd621d31a326c5..48cced47442e71a93c9f8a0583c511944105d55f 100644
--- a/content/browser/renderer_host/render_widget_host_input_event_router.cc
+++ b/content/browser/renderer_host/render_widget_host_input_event_router.cc
@@ -727,7 +727,8 @@ void RenderWidgetHostInputEventRouter::RouteTouchscreenGestureEvent(
     // send a GestureScrollBegin, as by the time we see GesturePinchBegin there
     // should have been one.
     if (root_view != touchscreen_gesture_target_.target &&
-        !rwhi->is_in_touchscreen_gesture_scroll()) {
+        !rwhi->IsInGestureScroll(
+            blink::WebGestureDevice::kWebGestureDeviceTouchscreen)) {
       gesture_pinch_did_send_scroll_begin_ = true;
       SendGestureScrollBegin(root_view, *event);
     }
@@ -743,7 +744,8 @@ void RenderWidgetHostInputEventRouter::RouteTouchscreenGestureEvent(
           static_cast<RenderWidgetHostImpl*>(root_view->GetRenderWidgetHost());
       if (root_view != touchscreen_gesture_target_.target &&
           gesture_pinch_did_send_scroll_begin_ &&
-          rwhi->is_in_touchscreen_gesture_scroll()) {
+          rwhi->IsInGestureScroll(
+              blink::WebGestureDevice::kWebGestureDeviceTouchscreen)) {
         SendGestureScrollEnd(root_view, *event);
       }
       gesture_pinch_did_send_scroll_begin_ = false;