Add TrimmedAppID to info service.

service/info/wrapper.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 info
+
+import (
+        "strings"
+
+        "golang.org/x/net/context"
+)
+
+type infoImpl struct {
+        RawInterface
+}
+
+var _ Interface = infoImpl{}
+
+func (i infoImpl) MustNamespace(namespace string) context.Context {

[dnj (Google), 2016/06/11 02:47:38]

Any reason *not* to make this a pointer receiver?

[iannucci, 2016/06/14 00:01:08]

double deref for no reason? additional opportunities for nils?

+        ret, err := i.Namespace(namespace)
+        if err != nil {
+                panic(err)
+        }
+        return ret
+}
+
+func (i infoImpl) TrimmedAppID() string {
+        toks := strings.Split(i.AppID(), ":")
+        return toks[len(toks)-1]
+}