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Also adds a typemap for TrainingExample.

Bug: 897463
Change-Id: I66d47d01e56e0a8f250783225662f258646e4cfa
Reviewed-on: https://chromium-review.googlesource.com/c/1338223
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#610162}