LogDog: Update client/bootstrap to generate URLs.

logdog/common/viewer/url.go

Index: logdog/common/viewer/url.go
diff --git a/logdog/common/viewer/url.go b/logdog/common/viewer/url.go
new file mode 100644
index 0000000000000000000000000000000000000000..eaece458ae213bfa35468cb42836855aec9dd21a
--- /dev/null
+++ b/logdog/common/viewer/url.go
@@ -0,0 +1,26 @@
+// 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 viewer is a support library to interact with the LogDog web app and
+// log stream viewer.
+package viewer
+
+import (
+	"fmt"
+	"net/url"
+	"strings"
+
+	"github.com/luci/luci-go/common/config"
+	"github.com/luci/luci-go/logdog/common/types"
+)
+
+// GetURL generates a LogDog app viewer URL for the specified streams.
+func GetURL(host string, project config.ProjectName, paths ...types.StreamPath) string {
+	pathQueries := make([]string, len(paths))

[Vadim Sh., 2016/10/27 23:50:05]

nit: use https://golang.org/pkg/net/url/#Values.Add and
https://golang.org/pkg/net/url/#Values.Encode

[dnj, 2016/10/28 00:01:45]

Oh shoot, I can't believe I forgot about this. Done, using "net/url.URL" for
everything.

+	for i, p := range paths {
+		pathQueries[i] = fmt.Sprintf("s=%s", url.QueryEscape(fmt.Sprintf("%s/%s", project, p)))
+	}
+
+	return fmt.Sprintf("https://%s/v/?%s", host, strings.Join(pathQueries, "&"))
+}