gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/service/gpu_scheduler.cc

Index: gpu/command_buffer/service/gpu_scheduler.cc
diff --git a/gpu/command_buffer/service/gpu_scheduler.cc b/gpu/command_buffer/service/gpu_scheduler.cc
index a40e98998424308ac529b1c23c6f0e2192fd76b8..cabf01bbc2ce56d26c87f0d7c065d01649ebf6d2 100644
--- a/gpu/command_buffer/service/gpu_scheduler.cc
+++ b/gpu/command_buffer/service/gpu_scheduler.cc
@@ -186,6 +186,10 @@ void GpuScheduler::set_token(int32 token) {
   command_buffer_->SetToken(token);
 }
 
+void GpuScheduler::set_serial(uint32 serial) {
+  command_buffer_->SetSerial(serial);
+}
+
 bool GpuScheduler::SetGetBuffer(int32 transfer_buffer_id) {
   Buffer ring_buffer = command_buffer_->GetTransferBuffer(transfer_buffer_id);
   if (!ring_buffer.ptr) {