Introduce a concept of publish to a library.

Test: ./gradlew createArchive no longer includes media-compat-test libraries.
Bug: 64531806
Change-Id: I8e8c1a764443895a5820102994ae96242220f90c
diff --git a/v7/gridlayout/build.gradle b/v7/gridlayout/build.gradle
index db85eda..50a9918 100644
--- a/v7/gridlayout/build.gradle
+++ b/v7/gridlayout/build.gradle
@@ -21,6 +21,7 @@
 
 supportLibrary {
     name 'Android Support Grid Layout'
+    publish true
     inceptionYear '2013'
     description 'Android Support Grid Layout'
 }