Add verbose logging for native accessibility events.

content/content_browser.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../cc/cc.gyp:cc',
     '../cc/cc.gyp:cc_surfaces',
     '../components/components.gyp:display_compositor',
@@ skipping 356 matching lines @@
       'browser/accessibility/accessibility_tree_formatter_utils_win.h',
       'browser/accessibility/accessibility_tree_formatter_win.cc',
       'browser/accessibility/accessibility_ui.cc',
       'browser/accessibility/accessibility_ui.h',
       'browser/accessibility/ax_tree_id_registry.cc',
       'browser/accessibility/ax_tree_id_registry.h',
       'browser/accessibility/browser_accessibility.cc',
       'browser/accessibility/browser_accessibility.h',
       'browser/accessibility/browser_accessibility_cocoa.h',
       'browser/accessibility/browser_accessibility_cocoa.mm',
+      'browser/accessibility/browser_accessibility_event.h',
+      'browser/accessibility/browser_accessibility_event.cc',
+      'browser/accessibility/browser_accessibility_event_win.h',
+      'browser/accessibility/browser_accessibility_event_win.cc',
       'browser/accessibility/browser_accessibility_mac.h',
       'browser/accessibility/browser_accessibility_mac.mm',
       'browser/accessibility/browser_accessibility_manager.cc',
       'browser/accessibility/browser_accessibility_manager.h',
       'browser/accessibility/browser_accessibility_manager_mac.h',
       'browser/accessibility/browser_accessibility_manager_mac.mm',
       'browser/accessibility/browser_accessibility_manager_win.cc',
       'browser/accessibility/browser_accessibility_manager_win.h',
       'browser/accessibility/browser_accessibility_state_impl.cc',
       'browser/accessibility/browser_accessibility_state_impl.h',
@@ skipping 1820 matching lines @@
       ],
     }],
     ['OS != "mac" and OS != "android"', {
       'sources!': [
         'browser/gpu/gpu_surface_tracker.cc',
         'browser/gpu/gpu_surface_tracker.h',
       ],
     }],
   ],
 }