Implement Mac Pop-up Dictionary for OOPIF.

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 703868a9a5f623478512244bd427d31074ca77a8..88e67f264d3b3205722f3463e5d7c20032089f0d 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
@@ -10,6 +10,7 @@
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/common/frame_messages.h"
+#include "content/public/browser/render_widget_host.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 namespace {
@@ -392,6 +393,17 @@ void RenderWidgetHostInputEventRouter::OnHittestData(
   hittest_data_[params.surface_id] = data;
 }
 
+#if defined(OS_MACOSX)
+RenderWidgetHost* RenderWidgetHostInputEventRouter::GetRenderWidgetHostAtPos(
+    RenderWidgetHostViewBase* root_view,
+    const gfx::Point& point,
+    gfx::Point* transformed_point) {
+  RenderWidgetHostViewBase* view =
+      FindEventTarget(root_view, point, transformed_point);
+  return view ? view->GetRenderWidgetHost() : nullptr;
+}
+#endif
+
 void RenderWidgetHostInputEventRouter::RouteTouchscreenGestureEvent(
     RenderWidgetHostViewBase* root_view,
     blink::WebGestureEvent* event,