milo: fix running steps

appengine/cmd/milo/logdog/logDogStream.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package logdog
 
 import (
         "fmt"
 
         miloProto "github.com/luci/luci-go/common/proto/milo"
 )
 
 // Streams represents a group of LogDog Streams with a single entry point.
 // Generally all of the streams are referenced by the entry point.
 type Streams struct {
         // MainStream is a pointer to the primary stream for this group of streams.
         MainStream *Stream
-        // Streams is the full list of streams referenced by MainStream, including
-        // MainStream.
+        // Streams is the full map streamName->stream referenced by MainStream.
+        // It includes MainStream.
         Streams map[string]*Stream
 }
 
 // GetFullPath returns the canonical URL of the logdog stream.
 func (s *Stream) GetFullPath() string {
         return fmt.Sprintf("https://%s/%s/+/%s", s.Server, s.Prefix, s.Path)
 }
 
 // Stream represents a single LogDog style stream, which can contain either
 // annotations (assumed to be MiloProtos) or text.  Other types of annotations are
 // not supported.
 type Stream struct {
         // Server is the LogDog server this stream originated from.
         Server string
         // Prefix is the LogDog prefix for the Stream.
         Prefix string
         // Path is the final part of the LogDog path of the Stream.
         Path string
         // IsDatagram is true if this is a MiloProto. False implies that this is a text log.
         IsDatagram bool
         // Data is the miloProto.Step of the Stream, if IsDatagram is true.  Otherwise
         // this is nil.
         Data *miloProto.Step
         // Text is the text of the Stream, if IsDatagram is false.  Otherwise
         // this is an empty string.
         Text string
 }