Bug 598862, part 3: Have plugin parents keep a 'proxy ref' to plugin X resources by duping the plugin's X socket. r=karlt

dom/plugins/PluginModuleParent.cpp

@@ -545,6 +545,19 @@ PluginModuleParent::NPP_SetValue(NPP instance, NPNVariable variable,
     return i->NPP_SetValue(variable, value);
 }
 
+bool
+PluginModuleParent::RecvBackUpXResources(const FileDescriptor& aXSocketFd)
+{
+#ifndef MOZ_X11
+    NS_RUNTIMEABORT("This message only makes sense on X11 platforms");
+#else
+    NS_ABORT_IF_FALSE(0 > mPluginXSocketFdDup.mFd,
+                      "Already backed up X resources??");
+    mPluginXSocketFdDup.mFd = aXSocketFd.fd;
+#endif
+    return true;
+}
+
 bool
 PluginModuleParent::AnswerNPN_UserAgent(nsCString* userAgent)
 {