[SetupDesign] Add proguard_flag_files for design library.

Bug: 254388464
Test: manual
Change-Id: Ib4ce4a962af4bde5e43957bada58bec645248682

1 files changed, 3 insertions, 0 deletions

diff --git a/Android.bp b/Android.bp
index 2cc13f0..35b6a3c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -47,6 +47,9 @@ android_library {
         "main/src/**/*.java",
     ],
     min_sdk_version: "14",
+    optimize: {
+        proguard_flags_files: ["proguard.flags"],
+    }
 }
 
 //