libweave: Add unittests for dbus_conversion.h

Added DBusConversionTest.DictionaryToDBusVariantDictionary test.
Others moved from schema_utils_unittests.cc.
Added serialization of "[[],[]]" as vector<Any>.

BUG=brillo:1245
TEST='FEATURES=test emerge-gizmo buffet'

Change-Id: Ib93a612d5d8dc45615912325b4f3c1d3877af976
Reviewed-on: https://chromium-review.googlesource.com/287845
Trybot-Ready: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
4 files changed
tree: 53485eaacf672ef94185ade831682ad9d6e9def6
  1. buffet/
  2. libweave/