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Adds simple helpers for policy EG tests to set policy values.
Values get serialized as JSON to be sent over IPC to the app interface.

This CL only adds overloads for boolean, base::Value and json-encoded
NSString*, but integer, std::string, arrays and dictionaries will be
added as needed.

Bug: 1065522
Change-Id: I750cdc3c4456baba91510422a13acb5dea3ea501
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2125039Reviewed-by: Tina Wang <tinazwang@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: sebsg <sebsg@chromium.org>
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Cr-Commit-Position: refs/heads/master@{#756742}