Use relative bounding boxes throughout Chrome accessibility

ui/accessibility/accessibility.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
 
   'targets': [
@@ skipping 14 matching lines @@
       ],
       'defines': [
         'ACCESSIBILITY_IMPLEMENTATION',
       ],
       'sources': [
         # All .cc, .h under accessibility, except unittests
         'ax_node.cc',
         'ax_node.h',
         'ax_node_data.cc',
         'ax_node_data.h',
+        'ax_relative_bounds.cc',
+        'ax_relative_bounds.h',
         'ax_serializable_tree.cc',
         'ax_serializable_tree.h',
         'ax_text_utils.cc',
         'ax_text_utils.h',
         'ax_tree.cc',
         'ax_tree.h',
         'ax_tree_combiner.cc',
         'ax_tree_combiner.h',
         'ax_tree_data.cc',
         'ax_tree_data.h',
@@ skipping 173 matching lines @@
           'type': 'none',
           'variables': {
             'source_file': 'ax_enums.idl',
           },
           'includes': [ '../../build/android/java_cpp_enum.gypi' ],
         },
       ],
     }],
   ],
 }