Added emitGradleZip to master build file.

Change-Id: I793389203a39a2a88922fcdee632897d8c798e03
diff --git a/build.gradle b/build.gradle
index ad075e4..d42baf8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -40,6 +40,7 @@
     "emitAnt",
     "emitGradle",
     "emitBrowseable",
+    "emitGradleZip",
 ]
 
 taskNames.each { taskName ->