Fix the mac hangup when force-compositing-mode is enabled

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 6e41354bcf3fee737d55d6fc1ff667ed1cd3a8ba..aced942b7eec48f74e5f768f5770c60e9a4013ac 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -391,11 +391,16 @@ void RenderWidget::OnSwapBuffersComplete()
   TRACE_EVENT0("renderer", "RenderWidget::OnSwapBuffersComplete");
   // When compositing deactivates, we reset the swapbuffers pending count.  The
   // swapbuffers acks may still arrive, however.
-  if (num_swapbuffers_complete_pending_ == 0) {
-    TRACE_EVENT0("renderer", "EarlyOut_ZeroSwapbuffersPending");
-    return;
+//if (num_swapbuffers_complete_pending_ == 0) {
+//  TRACE_EVENT0("renderer", "EarlyOut_ZeroSwapbuffersPending");
+//  return;
+//}
+//num_swapbuffers_complete_pending_--;

[jbates, 2011/06/07 16:47:52]

The num_swapbuffers_complete_pending_ count was wrong on OSX - perhaps when a
tab goes invisible. In any case, allowing it to EarlyOut here seemed to be
causing RAF-based demos to stop animating. Why not just render even when pending
is zero?

+  if (num_swapbuffers_complete_pending_ > 0) {
+    num_swapbuffers_complete_pending_--;
+  } else {
+    TRACE_EVENT0("renderer", "ZeroSwapbuffersPending");
   }
-  num_swapbuffers_complete_pending_--;
 
   // If update reply is still pending, then defer the update until that reply
   // occurs.