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This change introduces |FindKey|, |FindKeyOfType|, |SetKey|, |DictEnd| and
|DictItems| to base::Value. These methods are part of the new API proposal and
abstract away the pointer based underlying storage of Dictionary Values.

Bug: 646113
Change-Id: I09150f3b2fd47e24074caa50a30a058fc4f558a7
Reviewed-on: https://chromium-review.googlesource.com/561682
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Reviewed-by: Vladimir Levin <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486709}