Add Gradle plugin nightly 355 to x20 deps

Change-Id: I516d1988b0d4df7d130e1f5dc58009d24e5f5c37
diff --git a/build.gradle b/build.gradle
index f857f9e..efd8719 100644
--- a/build.gradle
+++ b/build.gradle
@@ -356,6 +356,7 @@
         "gmscore/gmscore_v9",
         "gmscore/gmscore_v10",
         "gmscore/latest",
+        "gradle-plugin",
         "photos/2017-06-06",
         "youtube/youtube.android_12.10",
         "youtube/youtube.android_12.17",
diff --git a/third_party/gradle-plugin.tar.gz.sha1 b/third_party/gradle-plugin.tar.gz.sha1
new file mode 100644
index 0000000..2fd1633
--- /dev/null
+++ b/third_party/gradle-plugin.tar.gz.sha1
@@ -0,0 +1 @@
+a0bea68a3b71d485296fe6aec54f995cdb6dd300
\ No newline at end of file