Milo: Fix ?limit= param

milo/frontend/view_builder.go

 // Copyright 2017 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 frontend
 
 import (
         "github.com/luci/luci-go/milo/buildsource"
         "github.com/luci/luci-go/server/router"
         "github.com/luci/luci-go/server/templates"
 )
 
 // BuilderHandler is responsible for taking a universal builder ID and rendering
 // the builder page (defined in ./appengine/templates/pages/builder.html).
 func BuilderHandler(c *router.Context, builderID buildsource.BuilderID) {
-        builder, err := builderID.Get(c.Context, c.Params.ByName("limit"), c.Params.ByName("cursor"))
+        limit := 25
+        if tLimit := GetLimit(c.Request, -1); tLimit >= 0 {
+                limit = tLimit
+        }
+        builder, err := builderID.Get(c.Context, limit, c.Request.FormValue("cursor"))
         // TODO(iannucci, hinoka): make MiloBuild refer to annotation stream by
         // host/prefix/path instead of by directly pulling it. Do all annotation
         // stream rendering in the frontend.
         if err != nil {
                 ErrorHandler(c, err)
         } else {
                 templates.MustRender(c.Context, c.Writer, "pages/builder.html", templates.Args{
                         "Builder": builder,
                 })
         }
 }