Milo: Add ?limit= support to builders

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"
         "os"
@@ skipping 76 matching lines @@
                         Code:    http.StatusBadRequest,
                 }
         }
         builder := p.ByName("builder")
         if builder == "" {
                 return nil, &miloerror.Error{
                         Message: "No builder",
                         Code:    http.StatusBadRequest,
                 }
         }
-
-        result, err := builderImpl(c, master, builder)
+        limit, err := settings.GetLimit(r)
         if err != nil {
                 return nil, err
         }
+        if limit < 0 {
+                limit = 25
+        }
+
+        result, err := builderImpl(c, master, builder, limit)
+        if err != nil {
+                return nil, err
+        }
 
         // Render into the template
         args := &templates.Args{
                 "Builder": result,
         }
         return args, nil
 }