Add gradle-plugin to download_all_benchmark_dependencies

Change-Id: I174cc1f36c83b35a6b82094d26098fec259b026b
diff --git a/tools/download_all_benchmark_dependencies.py b/tools/download_all_benchmark_dependencies.py
index 4c72e70..951d56f 100755
--- a/tools/download_all_benchmark_dependencies.py
+++ b/tools/download_all_benchmark_dependencies.py
@@ -8,11 +8,14 @@
 import gradle
 import sys
 import utils
+import os
 
 BUILD_TARGETS = ['downloadDeps', 'downloadAndroidCts', 'downloadDx']
 
 def Main():
   gradle.RunGradle(BUILD_TARGETS)
+  utils.DownloadFromX20(
+      os.path.join(utils.THIRD_PARTY, 'gradle-plugin') + '.tar.gz.sha1')
   utils.DownloadFromGoogleCloudStorage(utils.OPENSOURCE_APPS_SHA_FILE)
   utils.DownloadFromGoogleCloudStorage(utils.ANDROID_SDK + '.tar.gz.sha1',
                                        bucket='r8-deps-internal',