Route touch-events for WebViewGuest directly to guest renderer.

content/browser/renderer_host/render_widget_host_view_mac.h

Index: content/browser/renderer_host/render_widget_host_view_mac.h
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.h b/content/browser/renderer_host/render_widget_host_view_mac.h
index 3e0eb395d325066d3cc94f256bac91751424a4ee..459e42bf9d215afefb478f8cb4125cd5d3983a92 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.h
+++ b/content/browser/renderer_host/render_widget_host_view_mac.h
@@ -348,6 +348,8 @@ class CONTENT_EXPORT RenderWidgetHostViewMac
   uint32_t GetSurfaceIdNamespace() override;
   uint32_t SurfaceIdNamespaceAtPoint(const gfx::Point& point,
                                      gfx::Point* transformed_point) override;
+  // Returns true when we can do SurfaceHitTesting for the event type.
+  bool ShouldRouteEvent(const blink::WebInputEvent& event) const;
   void ProcessMouseEvent(const blink::WebMouseEvent& event) override;
   void ProcessMouseWheelEvent(const blink::WebMouseWheelEvent& event) override;
   void TransformPointToLocalCoordSpace(const gfx::Point& point,