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Adds a RandomTree that splits on features by decreasing entropy
improvement.  It does not select a random subset of features when
deciding on each split.  It also does not stop growing the tree
when no improvement is found, including pure leaves.

Bug: 902857
Change-Id: I742f64c71fd535bd7acc20b02b6478b20d9dae24
Reviewed-on: https://chromium-review.googlesource.com/c/1324130
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Fredrik Hubinette <hubbe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607368}