Provide skeleton for ChromeVox next.

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 884 matching lines @@
           'icu_use_data_file_flag%' : 1,
         }, {
           'icu_use_data_file_flag%' : 0,
         }],
       ],
 
       # Set this to 1 to enable use of concatenated impulse responses
       # for the HRTF panner in WebAudio.
       'use_concatenated_impulse_responses': 1,
 
+      # Whether to use the upcoming version of ChromeVox.
+      'use_chromevox_next%': 0,
+
       # You can set the variable 'use_official_google_api_keys' to 1
       # to use the Google-internal file containing official API keys
       # for Google Chrome even in a developer build.  Setting this
       # variable explicitly to 1 will cause your build to fail if the
       # internal file is missing.
       #
       # The variable is documented here, but not handled in this file;
       # see //google_apis/determine_use_official_keys.gypi for the
       # implementation.
       #
@@ skipping 448 matching lines @@
 
     # Set to 1 to compile with the hole punching for the protected video.
     'video_hole%': 0,
 
     # Set to 1 to compile with MSE support for MPEG2 TS
     'enable_mpeg2ts_stream_parser%': 0,
 
     # Support ChromeOS touchpad gestures with ozone.
     'use_evdev_gestures%': 0,
 
+    # Whether to use the upcoming version of ChromeVox.
+    'use_chromevox_next%': '<(use_chromevox_next)',
+
     'conditions': [
       # Enable the Syzygy optimization step for the official builds.
       ['OS=="win" and buildtype=="Official" and syzyasan!=1', {
         'syzygy_optimize%': 1,
       }, {
         'syzygy_optimize%': 0,
       }],
       # Get binutils version so we can enable debug fission if we can.
       ['os_posix==1 and OS!="mac" and OS!="ios"', {
         'conditions': [
@@ skipping 565 matching lines @@
       ['enable_resource_whitelist_generation==1 and OS!="win"', {
         'grit_rc_header_format': ['-h', '#define {textual_id} _Pragma("whitelisted_resource_{numeric_id}") {numeric_id}'],
       }],
       ['enable_resource_whitelist_generation==1 and OS=="win"', {
         'grit_rc_header_format': ['-h', '#define {textual_id} __pragma(message("whitelisted_resource_{numeric_id}")) {numeric_id}'],
       }],
       ['enable_mdns==1 or OS=="mac"', {
         'grit_defines': ['-D', 'enable_service_discovery'],
         'enable_service_discovery%': 1
       }],
+      ['use_chromevox_next==1', {
+        'grit_defines': ['-D', 'use_chromevox_next'],
+      }],
+
       ['clang_use_chrome_plugins==1 and OS!="win"', {
         'clang_chrome_plugins_flags': [
           '<!@(<(DEPTH)/tools/clang/scripts/plugin_flags.sh)'
         ],
       }],
 
       ['asan==1', {
         'clang%': 1,
       }],
       ['asan==1 and OS=="mac"', {
@@ skipping 3276 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }