Enable multidex for ChromePublicTests app

chrome/test/android/javatests/src/org/chromium/chrome/test/partnercustomizations/TestPartnerBrowserCustomizationsDelayedProvider.java

 // Copyright 2015 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.chrome.test.partnercustomizations;
 
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.Bundle;
 import android.text.TextUtils;
 
+import org.chromium.base.annotations.MainDex;
+
 import java.util.List;
 
 /**
  * PartnerBrowserCustomizationsProvider example for testing. This adds one second latency for
  * query function.
  * Note: if you move or rename this class, make sure you have also updated AndroidManifest.xml.
  */
-public class TestPartnerBrowserCustomizationsDelayedProvider extends
-        TestPartnerBrowserCustomizationsProvider {
-
+@MainDex
+public class TestPartnerBrowserCustomizationsDelayedProvider
+        extends TestPartnerBrowserCustomizationsProvider {
     private static String sUriPathToDelay;
 
     public TestPartnerBrowserCustomizationsDelayedProvider() {
         super();
         mTag = TestPartnerBrowserCustomizationsDelayedProvider.class.getSimpleName();
     }
 
     private void setUriPathToDelay(String path) {
         sUriPathToDelay = path;
     }
@@ skipping 15 matching lines @@
                     || (pathSegments != null && !pathSegments.isEmpty()
                             && TextUtils.equals(pathSegments.get(0), sUriPathToDelay))) {
                 Thread.sleep(1000);
             }
         } catch (InterruptedException e) {
             assert false;
         }
         return super.query(uri, projection, selection, selectionArgs, sortOrder);
     }
 }