Don't allow processing of a command buffer to overlap with a previous swap.

content/common/gpu/image_transport_surface_win.cc

Index: content/common/gpu/image_transport_surface_win.cc
diff --git a/content/common/gpu/image_transport_surface_win.cc b/content/common/gpu/image_transport_surface_win.cc
index a5f731aeb5ff513c0fd0084562246a5619293072..10a9b5da66298ebacd094ffa6f2420a960657793 100644
--- a/content/common/gpu/image_transport_surface_win.cc
+++ b/content/common/gpu/image_transport_surface_win.cc
@@ -199,6 +199,10 @@ void PbufferImageTransportSurface::SendBuffersSwapped() {
 
   DCHECK(!is_swap_buffers_pending_);
   is_swap_buffers_pending_ = true;
+
+  // Pause all processing of this command buffer.
+  // http://code.google.com/p/chromium/issues/detail?id=135546
+  DeferDraws();
 }
 
 void PbufferImageTransportSurface::OnBufferPresented(uint32 sync_point) {