buffet: Provide results definition in command definition.

That allows us to provide typed results for supported commands.

BUG=chromium:435607
TEST=cros_workon_make --test buffet

Change-Id: I61b5a5b294b4d869366c821adf1ef7f6db31c7ea
Reviewed-on: https://chromium-review.googlesource.com/231322
Reviewed-by: Anton Muhin <antonm@chromium.org>
Commit-Queue: Anton Muhin <antonm@chromium.org>
Tested-by: Anton Muhin <antonm@chromium.org>
diff --git a/buffet/device_registration_info_unittest.cc b/buffet/device_registration_info_unittest.cc
index 1ab5191..dd8ffbe 100644
--- a/buffet/device_registration_info_unittest.cc
+++ b/buffet/device_registration_info_unittest.cc
@@ -316,10 +316,12 @@
   auto json_base = buffet::unittests::CreateDictionaryValue(R"({
     'base': {
       'reboot': {
-        'parameters': {'delay': 'integer'}
+        'parameters': {'delay': 'integer'},
+        'results': {}
       },
       'shutdown': {
-        'parameters': {}
+        'parameters': {},
+        'results': {}
       }
     }
   })");
@@ -327,12 +329,14 @@
   auto json_cmds = buffet::unittests::CreateDictionaryValue(R"({
     'base': {
       'reboot': {
-        'parameters': {'delay': {'minimum': 10}}
+        'parameters': {'delay': {'minimum': 10}},
+        'results': {}
       }
     },
     'robot': {
       '_jump': {
-        'parameters': {'_height': 'integer'}
+        'parameters': {'_height': 'integer'},
+        'results': {}
       }
     }
   })");