Linux: move X operations from the IO to UI2 thread.

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index d5758f0d6843e18df6ae5b395d3269c3639234c3..15ead3e3957aa894a9a58eae73c8ab8c35e559fc 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -96,6 +96,15 @@ class BrowserProcess {
   // database. History has its own thread since it has much higher traffic.
   virtual base::Thread* db_thread() = 0;
 
+#if defined(OS_LINUX)
+  // Returns the thread that is used to process UI requests in cases were
+  // we can't route the request to the UI thread. Note that this thread
+  // should only be used by the IO thread and this method is only safe to call
+  // from the UI thread so, if you've ended up here, something has gone wrong.
+  // This method is only included for uniformity.
+  virtual base::Thread* background_x11_thread() = 0;
+#endif
+
   virtual sandbox::BrokerServices* broker_services() = 0;
 
   virtual IconManager* icon_manager() = 0;