Added support for getting and setting the CommandBuffer token and error....

o3d/gpu_plugin/command_buffer.cc

Index: o3d/gpu_plugin/command_buffer.cc
===================================================================
--- o3d/gpu_plugin/command_buffer.cc	(revision 26857)
+++ o3d/gpu_plugin/command_buffer.cc	(working copy)
@@ -11,7 +11,9 @@
     : npp_(npp),
       size_(0),
       get_offset_(0),
-      put_offset_(0) {
+      put_offset_(0),
+      token_(0),
+      error_(ERROR_NO_ERROR) {
   // Element zero is always NULL.
   registered_objects_.push_back(NPObjectPointer<NPObject>());
 }
@@ -152,5 +154,11 @@
   return registered_objects_[handle];
 }
 
+int32 CommandBuffer::ResetError() {
+  int32 last_error = error_;
+  error_ = ERROR_NO_ERROR;
+  return last_error;
+}
+
 }  // namespace gpu_plugin
 }  // namespace o3d