Enable runtime switching between ChromeVox and ChromeVox next via command line.

chrome/browser/resources/chromeos/chromevox/chromevox.gyp

 # Copyright 2014 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.
 
 {
   'conditions': [
     ['chromeos==1', {
       'variables': {
         # Whether to compress the 4 main ChromeVox scripts.  Applicable if
         # use_migrated_chromevox is true.
         'chromevox_compress_js%': '1',
         'background_script_loader_file': 'chromevox/background/loader.js',
         'content_script_loader_file': 'chromevox/injected/loader.js',
         'options_script_loader_file': 'chromevox/background/options_loader.js',
         'kbexplorer_loader_file': 'chromevox/background/kbexplorer_loader.js',
       },
       'includes': [
         'chromevox_tests.gypi',
         'common.gypi',
       ],
       'targets': [
         {
           'target_name': 'chromevox',
           'type': 'none',
           'dependencies': [
             'chromevox_resources',
             'chromevox_manifest',
             'chromevox_guest_manifest',
+            'chromevox2',
           ],
         },
         {
           'target_name': 'chromevox_resources',
           'type': 'none',
           'dependencies': [
             'chromevox_assets',
             'chromevox_static_files',
             'chromevox_strings',
             'chromevox_uncompiled_js_files',
@@ skipping 94 matching lines @@
               'variables': {
                 'grit_grd_file': 'strings/chromevox_strings.grd',
                 'grit_out_dir': '<(chromevox_dest_dir)',
                 # We don't generate any RC files, so no resource_ds file is needed.
                 'grit_resource_ids': '',
               },
               'includes': [ '../../../../../build/grit_action.gypi' ],
             },
           ],
         },
+        {
+          'target_name': 'chromevox2',
+          'type': 'none',
+          'dependencies': [
+            'chromevox2_copied_scripts',
+            'chromevox2_deps',
+            'chromevox2_manifest',
+            'chromevox2_guest_manifest',
+            'chromevox2_resources',
+          ],
+        },
+        {
+          'target_name': 'chromevox2_copied_scripts',
+          'type': 'none',
+          'variables': {
+            'dest_dir': '<(chromevox_dest_dir)',
+          },
+          'sources': [
+            'cvox2/background/loader.js',
+          ],
+          'includes': [ 'copy_js.gypi', ],
+        },
+        {
+          'target_name': 'chromevox2_deps',
+          'type': 'none',
+          'variables': {
+            'deps_js_output_file': '<(chromevox_dest_dir)/deps.js',
+          },
+          'sources': [
+            'cvox2/background/loader.js',
+          ],
+          'includes': ['generate_deps.gypi'],
+        },
+        {
+          'target_name': 'chromevox2_resources',
+          'type': 'none',
+          'copies': [
+            {
+              'destination': '<(PRODUCT_DIR)/resources/chromeos/chromevox/cvox2/background',
+              'files': [
+                'cvox2/background/background.html',
+              ],
+            },
+          ],
+        },
+        {
+          'target_name': 'chromevox2_manifest',
+          'type': 'none',
+          'variables': {
+            'output_manifest_path': '<(chromevox_dest_dir)/manifest_next.json',
+'use_chromevox_next': 1,
+          },
+          'includes': [ 'generate_manifest.gypi', ],
+        },
+        {
+          'target_name': 'chromevox2_guest_manifest',
+          'type': 'none',
+          'variables': {
+            'output_manifest_path': '<(chromevox_dest_dir)/manifest_next_guest.json',
+            'is_guest_manifest': 1,
+            'use_chromevox_next': 1,
+          },
+          'includes': [ 'generate_manifest.gypi', ],
+        },
       ],
       'conditions': [
         ['use_migrated_chromevox==1 and chromevox_compress_js==1', {
           'targets': [
             {
               'target_name': 'chromevox_content_script',
               'type': 'none',
               'variables': {
                 'output_file': '<(chromevox_dest_dir)/chromeVoxChromePageScript.js',
               },
@@ skipping 45 matching lines @@
                 '<(options_script_loader_file)',
               ],
               'includes': [ 'copy_js.gypi', ],
             },
           ],
         }],
       ],
     }],
   ],
 }