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/wear/build.gradle b/wear/build.gradle
index 12ab4d2..280f6bb 100644
--- a/wear/build.gradle
+++ b/wear/build.gradle
@@ -29,6 +29,7 @@
 
 supportLibrary {
     name 'Android Wear Support UI'
+    publish true
     inceptionYear '2016'
     description 'Android Wear Support UI'
 }