Milo buildbot builder page: Add pagnation with cursors.

milo/appengine/buildbot/html.go

 // Copyright 2015 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 buildbot
 
 import (
         "fmt"
         "net/http"
         "strconv"
@@ skipping 62 matching lines @@
                 return
         }
         limit, err := common.GetLimit(c.Request)
         if err != nil {
                 common.ErrorPage(c, http.StatusBadRequest, err.Error())
                 return
         }
         if limit < 0 {
                 limit = 25
         }
+        cursor := c.Request.FormValue("cursor")
 
-        result, err := builderImpl(c.Context, master, builder, limit)
+        result, err := builderImpl(c.Context, master, builder, limit, cursor)
         if err != nil {
                 common.ErrorPage(c, http.StatusInternalServerError, err.Error())
                 return
         }
 
         // Render into the template
         templates.MustRender(c.Context, c.Writer, "pages/builder.html", templates.Args{
                 "Builder": result,
         })
 }