Extend the multidex logic to only kick in for the main browser application.

chrome/android/java/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- 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. -->
 
 <!--
 Note: This is a jinja2 template, processed at build time into the final manifest.
 
 Blocks denoted with { % block some_name % }foo{ % endblock % } can be overridden
 by a child template that "extends" this file.
@@ skipping 586 matching lines @@
             android:process=":sandboxed_process{{ i }}"
             android:permission="{{ manifest_package }}.permission.CHILD_SERVICE"
             android:isolatedProcess="true"
             android:exported="false" />
         {% endfor %}
 
         {% set num_privileged_services = 3 %}
         <meta-data android:name="org.chromium.content.browser.NUM_PRIVILEGED_SERVICES"
             android:value="{{ num_privileged_services }}"/>
         {% for i in range(num_privileged_services) %}
+        {% set privileged_process_name = ':privileged_process%d' % i %}
+        <meta-data android:name="{{ manifest_package }}{{ privileged_process_name }}.ignore_multidex"

[Yaron, 2015/11/25 19:02:59]

nit: omit this for release builds (ok as follow-up)

[Ted C, 2015/11/25 19:14:11]

Added a TODO, this looks like it will require adding a new jinja variable as
build type is not exposed as of yet.  So a follow up will be better.

+android:value="true" />
         <service android:name="org.chromium.content.app.PrivilegedProcessService{{ i }}"
-            android:process=":privileged_process{{ i }}"
+            android:process="{{ privileged_process_name }}"
             android:permission="{{ manifest_package }}.permission.CHILD_SERVICE"
             android:isolatedProcess="false"
             android:exported="false" />
         {% endfor %}
 
         <receiver android:name="org.chromium.chrome.browser.download.OpenDownloadReceiver">
             <intent-filter>
                 <action android:name="android.intent.action.DOWNLOAD_NOTIFICATION_CLICKED"/>
             </intent-filter>
         </receiver>
@@ skipping 55 matching lines @@
              choose the first MediaRouteController that can play it, so the order of the list can be important.
              The most specific MediaRouteControllers should be listed first, followed by more generic ones.
              The downstream manifest replaces this block, and hence replaces the list of media route
              controllers with its own list. -->
         <meta-data android:name="org.chromium.content.browser.REMOTE_MEDIA_PLAYERS"
             android:value="org.chromium.chrome.browser.media.remote.DefaultMediaRouteController"/>
 
         {% endblock %}
     </application>
 </manifest>