Run event executor on the ui thread to remove the need to explicitly XFlush() the XTest calls.

base/message_pump_glib.cc

Index: base/message_pump_glib.cc
diff --git a/base/message_pump_glib.cc b/base/message_pump_glib.cc
index 721fedb6a63ab219043395b27353386daaa5c4bb..f12bb8abb622356180221b8b64033ad671462b5a 100644
--- a/base/message_pump_glib.cc
+++ b/base/message_pump_glib.cc
@@ -10,12 +10,41 @@
 #include <gtk/gtk.h>
 #include <glib.h>
 
+#include <string>
+#include <vector>
+
 #include "base/eintr_wrapper.h"
 #include "base/logging.h"
+#include "base/command_line.h"
 #include "base/threading/platform_thread.h"
 
 namespace {
 
+// TODO(jamiewalch): This is pretty much a direct copy of
+// gfx::GtkInitFromCommandLine. The fact that it calls gdk_init instead of
+// gtk_init is probably unimportant as the latter calls the former, but
+// we can't have base depending on ui so we can't use the function directly.
+void GdkInitFromCommandLine(const CommandLine& command_line) {
+  const std::vector<std::string>& args = command_line.argv();
+  int argc = args.size();
+  scoped_array<char *> argv(new char *[argc + 1]);
+  for (size_t i = 0; i < args.size(); ++i) {
+    // gdk_init makes no const-ness guarantees so best to be safe here. If it
+    // doesn't delete the arguments it consumes, then there is a small memory
+    // leak, but the alternative is far more severe.
+    argv[i] = strdup(args[i].c_str());
+  }
+  argv[argc] = NULL;
+  char **argv_pointer = argv.get();
+
+  gdk_init(&argc, &argv_pointer);
+  // gfx::GtkInitFromCommandLine uses args.size() instead of argc for the loop
+  // limit, which I believe is wrong, though probably benign.
+  for (int i = 0; i < argc; ++i) {
+    free(argv[i]);
+  }
+}
+
 // We send a byte across a pipe to wakeup the event loop.
 const char kWorkScheduled = '\0';
 
@@ -144,6 +173,9 @@ MessagePumpForUI::MessagePumpForUI()
     : state_(NULL),
       context_(g_main_context_default()),
       wakeup_gpollfd_(new GPollFD) {
+  // Initialize gdk.
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  GdkInitFromCommandLine(*command_line);
   // Create our wakeup pipe, which is used to flag when work was scheduled.
   int fds[2];
   CHECK_EQ(pipe(fds), 0);