Drag-and-drop: Target drag messages (the sequel).

content/browser/web_contents/web_drag_dest_mac.h

Index: content/browser/web_contents/web_drag_dest_mac.h
diff --git a/content/browser/web_contents/web_drag_dest_mac.h b/content/browser/web_contents/web_drag_dest_mac.h
index 2598ee0e886d265a7f0759a8574e7c91ef1c10c9..b44a828da007cea552a30f6b7db181d6713fc947 100644
--- a/content/browser/web_contents/web_drag_dest_mac.h
+++ b/content/browser/web_contents/web_drag_dest_mac.h
@@ -11,6 +11,7 @@
 #include "content/public/common/drop_data.h"
 
 namespace content {
+class RenderWidgetHostImpl;
 class RenderViewHost;
 class WebContentsImpl;
 class WebDragDestDelegate;
@@ -35,6 +36,9 @@ CONTENT_EXPORT
   // allow the drop.
   NSDragOperation currentOperation_;
 
+  // Tracks the current RenderWidgetHost we're dragging over.
+  base::WeakPtr<content::RenderWidgetHostImpl> currentRWHForDrag_;
+
   // Keep track of the render view host we're dragging over.  If it changes
   // during a drag, we need to re-send the DragEnter message.
   RenderViewHostIdentifier currentRVH_;