impl/prod: Expose Remote API scopes.

impl/prod/context.go

Index: impl/prod/context.go
diff --git a/impl/prod/context.go b/impl/prod/context.go
index 8a613253d2aa4cd85cc42a80895cc36ee07d1da8..92cb8af809de554a8206e186c7c277f577b67e85 100644
--- a/impl/prod/context.go
+++ b/impl/prod/context.go
@@ -19,6 +19,13 @@ import (
 	"google.golang.org/appengine/remote_api"
 )
 
+// RemoteAPIScopes is the set of OAuth2 scopes needed for Remote API access.
+var RemoteAPIScopes = []string{

[dnj, 2016/01/26 05:21:35]

This is useful when using external authentication (e.g., luci-go's auth
library).

+	"https://www.googleapis.com/auth/appengine.apis",
+	"https://www.googleapis.com/auth/userinfo.email",
+	"https://www.googleapis.com/auth/cloud.platform",
+}
+
 type key int
 
 var (
@@ -139,11 +146,7 @@ func UseRemote(inOutCtx *context.Context, host string, client *http.Client) (err
 			if aeCtx == nil {
 				aeCtx = context.Background()
 			}
-			client, err = gOAuth.DefaultClient(aeCtx,
-				"https://www.googleapis.com/auth/appengine.apis",
-				"https://www.googleapis.com/auth/userinfo.email",
-				"https://www.googleapis.com/auth/cloud.platform",
-			)
+			client, err = gOAuth.DefaultClient(aeCtx, RemoteAPIScopes...)
 			if err != nil {
 				return
 			}