Revert of Migrate tsmon protos to proto3

common/tsmon/context.go

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package tsmon
 
 import (
         "sync"
 
+        "github.com/golang/protobuf/proto"
         "golang.org/x/net/context"
 
         "github.com/luci/luci-go/common/tsmon/monitor"
         "github.com/luci/luci-go/common/tsmon/store"
         "github.com/luci/luci-go/common/tsmon/target"
         "github.com/luci/luci-go/common/tsmon/types"
 )
 
 // State holds the configuration of the tsmon library.  There is one global
 // instance of State, but it can be overridden in a Context by tests.
@@ skipping 39 matching lines @@
         return WithState(c, &State{
                 S:                 s,
                 M:                 m,
                 RegisteredMetrics: map[string]types.Metric{},
         }), s, m
 }
 
 // WithDummyInMemory returns a new context holding a new State with a new in-
 // memory store and a fake monitor.
 func WithDummyInMemory(c context.Context) (context.Context, *monitor.Fake) {
-        s := store.NewInMemory(&target.Task{})
+        s := store.NewInMemory(&target.Task{ServiceName: proto.String("")})
         m := &monitor.Fake{}
         return WithState(c, &State{
                 S:                 s,
                 M:                 m,
                 RegisteredMetrics: map[string]types.Metric{},
         }), m
 }
 
 type key int
 
 var (
         globalState = &State{
                 S:                 store.NewNilStore(),
                 M:                 monitor.NewNilMonitor(),
                 RegisteredMetrics: map[string]types.Metric{},
         }
         stateKey key = 1
 )