[Do Not Submit] Rough draft enabling junit tests for android studio

build/android/gradle/build.gradle.jinja

Index: build/android/gradle/build.gradle.jinja
diff --git a/build/android/gradle/build.gradle.jinja b/build/android/gradle/build.gradle.jinja
index 98359046dea1058f5b6f30bf820546b96d7020d5..508b38ab7755afabff2d4d86e8c063715156bc5e 100644
--- a/build/android/gradle/build.gradle.jinja
+++ b/build/android/gradle/build.gradle.jinja
@@ -80,6 +80,7 @@ dependencies {
 {% endfor %}
 }
 
+{% if template_type != 'java_library' %}
 afterEvaluate {
     def tasksToDisable = tasks.findAll {
         return (it.name.equals('generateDebugSources')  // causes unwanted AndroidManifest.java
@@ -98,5 +99,6 @@ afterEvaluate {
       task.enabled = false
     }
 }
+{% endif %}
 
 {% endif %}