Add 5 experimental accessibility features on Chrome OS.

chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc

 // 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.
 
 #include "chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.h"
 
 #include <string>
 
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
@@ skipping 73 matching lines @@
       {"clickOnStopLabel", IDS_SETTINGS_CLICK_ON_STOP_LABEL},
       {"delayBeforeClickLabel", IDS_SETTINGS_DELAY_BEFORE_CLICK_LABEL},
       {"delayBeforeClickExtremelyShort",
        IDS_SETTINGS_DELAY_BEFORE_CLICK_EXTREMELY_SHORT},
       {"delayBeforeClickVeryShort", IDS_SETTINGS_DELAY_BEFORE_CLICK_VERY_SHORT},
       {"delayBeforeClickShort", IDS_SETTINGS_DELAY_BEFORE_CLICK_SHORT},
       {"delayBeforeClickLong", IDS_SETTINGS_DELAY_BEFORE_CLICK_LONG},
       {"delayBeforeClickVeryLong", IDS_SETTINGS_DELAY_BEFORE_CLICK_VERY_LONG},
       {"onScreenKeyboardLabel", IDS_SETTINGS_ON_SCREEN_KEYBOARD_LABEL},
       {"a11yExplanation", IDS_SETTINGS_ACCESSIBILITY_EXPLANATION},
+      {"caretHighlightLabel",
+       IDS_OPTIONS_SETTINGS_ACCESSIBILITY_CARET_HIGHLIGHT_DESCRIPTION },
+      {"cursorHighlightLabel",
+       IDS_OPTIONS_SETTINGS_ACCESSIBILITY_CURSOR_HIGHLIGHT_DESCRIPTION },
+      {"focusHighlightLabel",
+       IDS_OPTIONS_SETTINGS_ACCESSIBILITY_FOCUS_HIGHLIGHT_DESCRIPTION },
+      {"selectToSpeakLabel",
+       IDS_OPTIONS_SETTINGS_ACCESSIBILITY_SELECT_TO_SPEAK_DESCRIPTION },
+      {"switchAccessLabel",
+       IDS_OPTIONS_SETTINGS_ACCESSIBILITY_SWITCH_ACCESS_DESCRIPTION },
   };
   AddLocalizedStringsBulk(html_source, localized_strings,
                           arraysize(localized_strings));
 
   html_source->AddString("a11yLearnMoreUrl",
                          chrome::kChromeAccessibilityHelpURL);

[Dan Beam, 2016/03/11 22:07:20]

I think rather than making an A11yHandler, you should do:

  html_source->AddBoolean("experimentalA11yFeaturesEnabled", ...);

here, and then from javascript you can do:

  if (loadTimeData.getBoolean('experimentalA11yFeaturesEnabled'))
    ...

i didn't name this file or all the methods in it "Strings", so it's not my fault
you're adding ... a boolean ;)

 }
 #endif
 
 #if defined(OS_CHROMEOS)
 void AddAccountUITweaksStrings(content::WebUIDataSource* html_source,
                                Profile* profile) {
   base::DictionaryValue localized_values;
   chromeos::AddAccountUITweaksLocalizedValues(&localized_values, profile);
   html_source->AddLocalizedStrings(localized_values);
 }
@@ skipping 687 matching lines @@
 #endif
   AddUsersStrings(html_source);
   AddWebContentStrings(html_source);
 
   policy_indicator::AddLocalizedStrings(html_source);
 
   html_source->SetJsonPath(kLocalizedStringsFile);
 }
 
 }  // namespace settings