Implement Gesture event hit testing/forwarding for OOPIF.

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index 3c3b480256ca2b7b6807c4750fd98ca6f030822b..4487ebd7570c8fe04bc31dce471818b0b5bbec46 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -408,6 +408,12 @@ void RenderWidgetHostViewChildFrame::ProcessTouchEvent(
   host_->ForwardTouchEventWithLatencyInfo(event, latency);
 }
 
+void RenderWidgetHostViewChildFrame::ProcessGestureEvent(
+    const blink::WebGestureEvent& event,
+    const ui::LatencyInfo& latency) {
+  host_->ForwardGestureEventWithLatencyInfo(event, latency);
+}
+
 gfx::Point RenderWidgetHostViewChildFrame::TransformPointToRootCoordSpace(
     const gfx::Point& point) {
   if (!frame_connector_)