Add beginnings of android_apk and unittest_apk templates

base/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
@@ skipping 1403 matching lines @@
     sources = [
       "android/java/templates/NativeLibraries.template",
     ]
     inputs = [
       "android/java/templates/native_libraries_array.h",
     ]
 
     package_name = "org/chromium/base/library_loader"
     include_path = "android/java/templates"
   }
+
+  android_library("base_java_unittest_support") {
+    deps = [":base_java"]
+    java_files = [
+      "test/android/java/src/org/chromium/base/ContentUriTestUtils.java"
+    ]
+  }
+
+  unittest_apk("base_unittests_apk") {
+    deps = [
+      ":base_java",
+      ":base_java_unittest_support",
+      ":base_unittests",
+    ]
+    unittests_dep = ":base_unittests"
+  }
 }