Milo: Use custom config caching layer

luci_config/server/cfgclient/backend/backend.go

Index: luci_config/server/cfgclient/backend/backend.go
diff --git a/luci_config/server/cfgclient/backend/backend.go b/luci_config/server/cfgclient/backend/backend.go
index c0e2557faf19c997b04a469026d26813b2241864..6c3ed95f47a30a83385d4bd55b69c831d57b0776 100644
--- a/luci_config/server/cfgclient/backend/backend.go
+++ b/luci_config/server/cfgclient/backend/backend.go
@@ -7,6 +7,8 @@ package backend
 import (
 	"net/url"
 
+	"github.com/luci/luci-go/common/config"
+
 	"golang.org/x/net/context"
 )
 
@@ -63,6 +65,9 @@ type B interface {
 
 	// ConfigSetURL returns the URL for the specified config set.
 	ConfigSetURL(c context.Context, configSet string, p Params) (url.URL, error)
+
+	// GetConfigInterface returns the raw configuration interface for the backend.

[nodir, 2017/04/05 21:47:50]

s/for/of/

[hinoka, 2017/04/06 03:34:33]

Done.

+	GetConfigInterface(c context.Context, a Authority) config.Interface
 }
 
 // Factory is a function that generates a B given a Context.