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Add a section to chrome://snippets-internals to allow
testing and fetching contextual suggestions.
The section is only shown when flag
ContextualSuggestionsCarousel is on.

Bug: 749988
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I9cd371973c6871f93996515a1ac0eab5d3067343
Reviewed-on: https://chromium-review.googlesource.com/595974
Commit-Queue: Andre Gaschler <gaschler@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491680}