Add MonochromePublic.minimal.apks to continuous testing

Change-Id: Ic086f80dc47fa3f51f44d63abf263f71b4853921
diff --git a/build.gradle b/build.gradle
index 338df88..cec21ac 100644
--- a/build.gradle
+++ b/build.gradle
@@ -404,6 +404,7 @@
         "benchmarks/kotlin-benches",
         "chrome/chrome_180917_ffbaa8",
         "chrome/chrome_200430",
+        "chrome/monochrome_public_minimal_apks/chrome_200520",
         "classlib",
         "cf_segments",
         "desugar/desugar_20180308",