Add a simple task to collect dependencies

Change-Id: I0a93df3a7fef5bb0cdfc79dbc1c0d8d45e5d481e
diff --git a/build.gradle b/build.gradle
index e9bfe8e..225d87a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1526,3 +1526,8 @@
   include '**/com/android/tools/r8/D8Output.java'
   include '**/com/android/tools/r8/Resource.java'
 }
+
+task copyMavenDeps(type: Copy) {
+    from configurations.compile into "$buildDir/deps"
+    from configurations.testCompile into "$buildDir/deps"
+}