Bug 1153518, allow drops on editors when the source is a remote browser, r=ehsan

editor/libeditor/moz.build

@@ -70,4 +70,6 @@ LOCAL_INCLUDES += [
     '/layout/xul',
 ]
 
+include('/ipc/chromium/chromium-config.mozbuild')
+
 FINAL_LIBRARY = 'xul'

editor/libeditor/nsEditorEventListener.cpp

@@ -59,6 +59,8 @@
 #include "nsIBidiKeyboard.h"            // for nsIBidiKeyboard
 #endif
 
+#include "mozilla/dom/TabParent.h"
+
 class nsPresContext;
 
 using namespace mozilla;
@@ -985,6 +987,14 @@ nsEditorEventListener::CanDrop(nsIDOMDragEvent* aEvent)
     return true;
   }
 
+  // If the source node is a remote browser, treat this as coming from a
+  // different document and allow the drop.
+  nsCOMPtr<nsIContent> sourceContent = do_QueryInterface(sourceNode);
+  TabParent* tp = TabParent::GetFrom(sourceContent);
+  if (tp) {
+    return true;
+  }
+
   nsRefPtr<Selection> selection = mEditor->GetSelection();
   if (!selection) {
     return false;