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

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index 5e1d9f39565792a8a288abc4151d839a9f18886b..5b7b6b65121981e68b366d5365c49521bd5b00be 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -171,6 +171,11 @@ BrowserProcessImpl::~BrowserProcessImpl() {
   io_thread_->message_loop()->PostTask(FROM_HERE,
       NewRunnableFunction(chrome_browser_net::EnsureDnsPrefetchShutdown));
 
+#if defined(OS_LINUX)
+  // The IO thread must outlive the BACKGROUND_X11 thread.
+  background_x11_thread_.reset();
+#endif
+
   // Need to stop io_thread_ before resource_dispatcher_host_, since
   // io_thread_ may still deref ResourceDispatcherHost and handle resource
   // request before going away.
@@ -284,6 +289,16 @@ void BrowserProcessImpl::CreateIOThread() {
   // invoke the io_thread() accessor.
   PluginService::GetInstance();
 
+#if defined(OS_LINUX)
+  // The lifetime of the BACKGROUND_X11 thread is a subset of the IO thread so
+  // we start it now.
+  scoped_ptr<base::Thread> background_x11_thread(
+      new BrowserProcessSubThread(ChromeThread::BACKGROUND_X11));
+  if (!background_x11_thread->Start())
+    return;
+  background_x11_thread_.swap(background_x11_thread);
+#endif
+
   scoped_ptr<base::Thread> thread(
       new BrowserProcessSubThread(ChromeThread::IO));
   base::Thread::Options options;