message: Add Identity op with resource input/output to xla_device_ops.h.
diff: @@ -101,6 +101,15 @@ class XlaAssignVariableOp : public OpKernel {
  REGISTER_KERNEL_BUILDER( \
  Name("Identity").Device(DEVICE).TypeConstraint("T", DT_STRING), \
  IdentityOp); \
  + REGISTER_KERNEL_BUILDER( \
  + Name("Identity").Device(DEVICE).TypeConstraint<Variant>("T"), \
  + IdentityOp); \
  + REGISTER_KERNEL_BUILDER(Name("Identity") \
  + .Device(DEVICE) \
  + .TypeConstraint<ResourceHandle>("T") \
  + .HostMemory("input") \
  + .HostMemory("output"), \
  + IdentityOp); \
  REGISTER_KERNEL_BUILDER(Name("IdentityN").Device(DEVICE), IdentityNOp); \
  REGISTER_KERNEL_BUILDER(Name("Placeholder").Device(DEVICE), PlaceholderOp); \
  REGISTER_KERNEL_BUILDER(Name("PlaceholderV2").Device(DEVICE), \
  