Another update of gencode flags.
Another update of gencode flags.

xiongzhanblake/code-samples,MMp131316/code-samples,MMp131316/code-samples,MMp131316/code-samples,MMp131316/code-samples,xiongzhanblake/code-samples,xiongzhanblake/code-samples,MMp131316/code-samples,xiongzhanblake/code-samples,xiongzhanblake/code-samples,MMp131316/code-samples,xiongzhanblake/code-samples,MMp131316/code-samples,xiongzhanblake/code-samples