Upstream: DexOptimizer and DexLoader classes

chrome/android/webapk/shell_apk/javatests/canary_lib/BUILD.gn

+# 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.
+
+import("//build/config/android/rules.gni")
+
+android_library("canary_lib") {
+  dex_path = "$target_gen_dir/canary.dex"
+  java_files = [ "src/org/chromium/webapk/shell_apk/test/canary/Canary.java" ]
+}
+
+# dex asset added to dex_optimizer_apk in order to test creating ClassLoader
+# from .dex in remote APK.
+android_assets("canary_dex_asset") {
+  sources = [
+    "$target_gen_dir/canary.dex",
+  ]
+  disable_compression = true
+  deps = [
+    ":canary_lib",
+  ]
+}