Change MessagePumpLibevent::Run to process I/O events before doing idle

base/message_pump_libevent.cc

Index: base/message_pump_libevent.cc
===================================================================
--- base/message_pump_libevent.cc	(revision 91167)
+++ base/message_pump_libevent.cc	(working copy)
@@ -107,6 +107,7 @@
 MessagePumpLibevent::MessagePumpLibevent()
     : keep_running_(true),
       in_run_(false),
+      processed_io_events_(false),
       event_base_(event_base_new()),
       wakeup_pipe_in_(-1),
       wakeup_pipe_out_(-1) {
@@ -226,6 +227,12 @@
     if (!keep_running_)
       break;
 
+    event_base_loop(event_base_, EVLOOP_NONBLOCK);
+    did_work |= processed_io_events_;
+    processed_io_events_ = false;
+    if (!keep_running_)
+      break;
+
     did_work |= delegate->DoDelayedWork(&delayed_work_time_);
     if (!keep_running_)
       break;
@@ -331,6 +338,7 @@
       static_cast<FileDescriptorWatcher*>(context);
 
   MessagePumpLibevent* pump = controller->pump();
+  pump->processed_io_events_ = true;
 
   if (flags & EV_WRITE) {
     controller->OnFileCanWriteWithoutBlocking(fd, pump);
@@ -351,6 +359,7 @@
   char buf;
   int nread = HANDLE_EINTR(read(socket, &buf, 1));
   DCHECK_EQ(nread, 1);
+  that->processed_io_events_ = true;
   // Tell libevent to break out of inner loop.
   event_base_loopbreak(that->event_base_);
 }