[Android] Generate scripts at build time to run android tests.

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")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 1309 matching lines @@
   # strings
   if (is_mac || is_ios || is_chromeos) {
     defines = [ "SYSTEM_NATIVE_UTF8" ]
   }
 
   if (is_android) {
     apk_deps = [
       ":base_java",
       ":base_java_unittest_support",
     ]
+    isolate_file = "base_unittests.isolate"
   }
 
   if (is_ios) {
     sources -= [
       "process/memory_unittest.cc",
       "process/memory_unittest_mac.h",
       "process/memory_unittest_mac.mm",
       "process/process_unittest.cc",
       "process/process_util_unittest.cc",
     ]
@@ skipping 163 matching lines @@
 
   # GYP: //base.gyp:base_java_unittest_support
   android_library("base_java_unittest_support") {
     deps = [
       ":base_java",
     ]
     java_files =
         [ "test/android/java/src/org/chromium/base/ContentUriTestUtils.java" ]
   }
 }