gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/client/cmd_buffer_helper.cc

Index: gpu/command_buffer/client/cmd_buffer_helper.cc
diff --git a/gpu/command_buffer/client/cmd_buffer_helper.cc b/gpu/command_buffer/client/cmd_buffer_helper.cc
index 11219ede664751e3fa92a2dcc800388f8d4d3f5c..85266990b49c290b34f7a6f3ba528bce835bcef8 100644
--- a/gpu/command_buffer/client/cmd_buffer_helper.cc
+++ b/gpu/command_buffer/client/cmd_buffer_helper.cc
@@ -169,6 +169,12 @@ int32 CommandBufferHelper::InsertToken() {
   return token_;
 }
 
+bool CommandBufferHelper::HasTokenPassed(int32 token) {
+  if (token > token_)
+    return true;  // we wrapped
+  return last_token_read() >= token;
+}
+
 // Waits until the current token value is greater or equal to the value passed
 // in argument.
 void CommandBufferHelper::WaitForToken(int32 token) {