Android: Android studio single module per target

build/android/gradle/dependencies.jinja

 {# Copyright 2016 The Chromium Authors. All rights reserved. #}
 {# Use of this source code is governed by a BSD-style license that can be #}
 {# found in the LICENSE file. #}
 {% macro expand_deps(variables, prefix) %}
 {% if variables is defined %}
+{% if variables.prebuilts is defined %}
 {% for path in variables.prebuilts %}
     {{ prefix }} files("{{ path }}")
 {% endfor %}
+{% endif %}
+{% if variables.java_project_deps is defined %}
 {% for proj in variables.java_project_deps %}
     {{ prefix }} project(":{{ proj }}")
 {% endfor %}
+{% endif %}
+{% if variables.android_project_deps is defined %}
 {% for proj in variables.android_project_deps %}
     {{ prefix }} project(path: ":{{ proj }}", configuration: "debug")
 {% endfor %}
 {% endif %}
+{% endif %}
 {% endmacro %}
 
 dependencies {
 {{ expand_deps(main, 'compile') }}
 {{ expand_deps(test, 'testCompile') }}
 {{ expand_deps(android_test, 'androidTestCompile') }}
 }