luci_depkoy: Add instance class, params.

deploytool/api/deploy/checkout.pb.go

 // Code generated by protoc-gen-go.
 // source: github.com/luci/luci-go/deploytool/api/deploy/checkout.proto
 // DO NOT EDIT!
 
 /*
 Package deploy is a generated protocol buffer package.
 
 It is generated from these files:
         github.com/luci/luci-go/deploytool/api/deploy/checkout.proto
         github.com/luci/luci-go/deploytool/api/deploy/component.proto
         github.com/luci/luci-go/deploytool/api/deploy/config.proto
         github.com/luci/luci-go/deploytool/api/deploy/internal.proto
         github.com/luci/luci-go/deploytool/api/deploy/userconfig.proto
 
 It has these top-level messages:
         SourceLayout
         SourceInitResult
         GoPath
         Component
         BuildPath
+        Duration
         AppEngineModule
         AppEngineResources
         ContainerEnginePod
         KubernetesPod
         Layout
         Source
         Application
         Deployment
         FrozenLayout
         UserConfig
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 }