[Android] Enable multidex for release builds of chrome_public_test_apk.

base/test/android/javatests/src/org/chromium/base/test/BaseChromiumInstrumentationTestRunner.java

 // 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.
 
 package org.chromium.base.test;
 
-import android.os.Bundle;
+import android.app.Application;
+import android.content.Context;
 
+import org.chromium.base.annotations.MainDex;
 import org.chromium.base.multidex.ChromiumMultiDexInstaller;
 import org.chromium.base.test.util.CommandLineFlags;
 
 // TODO(jbudorick): Add support for on-device handling of timeouts.
 /**
  * An Instrumentation test runner for applications that are based on
  * {@code org.chromium.base.BaseChromiumApplication}
  */
+@MainDex
 public class BaseChromiumInstrumentationTestRunner extends BaseInstrumentationTestRunner {
     @Override
-    public void onCreate(Bundle arguments) {
-        ChromiumMultiDexInstaller.install(getTargetContext());
-        super.onCreate(arguments);
+    public Application newApplication(ClassLoader cl, String className, Context context)
+            throws ClassNotFoundException, IllegalAccessException, InstantiationException {
+        ChromiumMultiDexInstaller.install(new BaseChromiumRunnerCommon.MultiDexContextWrapper(
+                getContext(), getTargetContext()));
+        BaseChromiumRunnerCommon.reorderDexPathElements(cl, getContext(), getTargetContext());
+        return super.newApplication(cl, className, context);
     }
 
     /**
      * Override this method to register hooks and checks to be run for each test. Make sure to call
      * the base implementation if you do so.
      *
      * @see BaseTestResult#addSkipCheck(BaseTestResult.SkipCheck)
      * @see BaseTestResult#addPreTestHook(BaseTestResult.PreTestHook)
      */
     @Override
     protected void addTestHooks(BaseTestResult result) {
         super.addTestHooks(result);
         result.addPreTestHook(CommandLineFlags.getRegistrationHook());
     }
 }