Implement Gesture event hit testing/forwarding for OOPIF.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 6963b213ad3806a21bdf94826a1268a601d402f4..423d032d6d294d51b31dcf1018d2e1fa905e909e 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -2260,6 +2260,12 @@ void RenderWidgetHostViewAura::ProcessTouchEvent(
   host_->ForwardTouchEventWithLatencyInfo(event, latency);
 }
 
+void RenderWidgetHostViewAura::ProcessGestureEvent(
+    const blink::WebGestureEvent& event,
+    const ui::LatencyInfo& latency) {
+  host_->ForwardGestureEventWithLatencyInfo(event, latency);
+}
+
 void RenderWidgetHostViewAura::TransformPointToLocalCoordSpace(
     const gfx::Point& point,
     cc::SurfaceId original_surface,
@@ -2368,11 +2374,21 @@ void RenderWidgetHostViewAura::OnGestureEvent(ui::GestureEvent* event) {
     blink::WebGestureEvent fling_cancel = gesture;
     fling_cancel.type = blink::WebInputEvent::GestureFlingCancel;
     fling_cancel.sourceDevice = blink::WebGestureDeviceTouchscreen;
-    host_->ForwardGestureEvent(fling_cancel);
+    if (ShouldRouteEvent(event)) {
+      host_->delegate()->GetInputEventRouter()->RouteGestureEvent(
+          this, &fling_cancel, ui::LatencyInfo());
+    } else {
+      host_->ForwardGestureEvent(fling_cancel);
+    }
   }
 
   if (gesture.type != blink::WebInputEvent::Undefined) {
-    host_->ForwardGestureEventWithLatencyInfo(gesture, *event->latency());
+    if (ShouldRouteEvent(event)) {
+      host_->delegate()->GetInputEventRouter()->RouteGestureEvent(
+          this, &gesture, *event->latency());
+    } else {
+      host_->ForwardGestureEventWithLatencyInfo(gesture, *event->latency());
+    }
 
     if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN ||
         event->type() == ui::ET_GESTURE_SCROLL_UPDATE ||