Milo: Add ?limit= support to builders

milo/appengine/buildbot/html.go

Index: milo/appengine/buildbot/html.go
diff --git a/milo/appengine/buildbot/html.go b/milo/appengine/buildbot/html.go
index 6d9e24418341a5635223aaa04039c2ae0d9a97bc..ba8e007479ea61641f4dd609a8b8338ce15d02ad 100644
--- a/milo/appengine/buildbot/html.go
+++ b/milo/appengine/buildbot/html.go
@@ -94,8 +94,15 @@ func (b Builder) Render(c context.Context, r *http.Request, p httprouter.Params)
 			Code:    http.StatusBadRequest,
 		}
 	}
+	limit, err := settings.GetLimit(r)
+	if err != nil {
+		return nil, err
+	}
+	if limit < 0 {
+		limit = 25
+	}
 
-	result, err := builderImpl(c, master, builder)
+	result, err := builderImpl(c, master, builder, limit)
 	if err != nil {
 		return nil, err
 	}