Add accessibility settings metrics

chrome/browser/resources/options/browser_options.html

 <div id="settings" class="page" hidden>
   <header>
     <h1 i18n-content="settingsTitle"></h1>
   </header>
   <include src="reset_profile_settings_banner.html">
   <include src="automatic_settings_reset_banner.html">
 <if expr="chromeos">
   <include src="secondary_user_banner.html">
   <section>
     <div id="network-section-header" class="section-header">
@@ skipping 668 matching lines @@
       <button id="cloudPrintDevicesPageButton"
               i18n-content="cloudPrintDevicesPageButton">
       </button>
 
       <div class="checkbox"
            i18n-values=".hidden: cloudPrintHideNotificationsCheckbox">
         <span class="controlled-setting-with-label">
           <input id="local-discovery-notifications-enabled"
                  pref="local_discovery.notifications_enabled"
                  type="checkbox"
-                 metric="LocalDiscoveryNotificationsDisabled_Settings" />
+                 metric="LocalDiscoveryNotificationsDisabled_Settings">
           <span>
             <label for="local-discovery-notifications-enabled"
                    i18n-content="cloudPrintEnableNotificationsLabel">
             </label>
             <span class="controlled-setting-indicator"
                   pref="local_discovery.notifications_enabled">
             </span>
           </span>
         </span>
       </div>
     </section>
 </if>
 
 <if expr="chromeos">
   <include src="startup_section.html">
   <section>
     <h3 i18n-content="accessibilityTitle"></h3>
     <div class="option-control-table">
       <p id="accessibility-explanation" class="settings-row">
         <span i18n-content="accessibilityExplanation"></span>
-        <a target="_blank" i18n-content="learnMore"
-            i18n-values="href:accessibilityLearnMoreURL"></a>
+        <a id="accessibility-learn-more" target="_blank"
+           i18n-content="learnMore"></a>
       </p>
       <div class="option-name">
         <div class="checkbox">
           <span class="controlled-setting-with-label">
             <input id="accessibility-should-always-show-menu"
-                pref="settings.a11y.enable_menu" type="checkbox">
+                   pref="settings.a11y.enable_menu" type="checkbox"
+                   metric="Options_AccessibilitySystemMenu">
             <span>
               <label for="accessibility-should-always-show-menu"
                   i18n-content="accessibilityAlwaysShowMenu">
               </label>
               <span class="controlled-setting-indicator"
                   pref="settings.a11y.enable_menu">
               </span>
           </span>
         </div>
       </div>
       <div class="option-name">
         <div class="checkbox">
           <span class="controlled-setting-with-label">
             <input id="accessibility-large-cursor-check"
-                pref="settings.a11y.large_cursor_enabled" type="checkbox">
+                   pref="settings.a11y.large_cursor_enabled" type="checkbox"
+                   metric="Options_AccessibilityLargeMouseCursor">
             <span>
               <label for="accessibility-large-cursor-check"
                   i18n-content="accessibilityLargeCursor">
               </label>
               <span class="controlled-setting-indicator"
                   pref="settings.a11y.large_cursor_enabled">
               </span>
             </span>
           </span>
         </div>
       </div>
       <div class="option-name">
         <div class="checkbox">
           <span class="controlled-setting-with-label">
             <input id="accessibility-high-contrast-check"
-                pref="settings.a11y.high_contrast_enabled" type="checkbox">
+                   pref="settings.a11y.high_contrast_enabled" type="checkbox"
+                   metric="Options_AccessibilityHighContrastMode">
             <span>
               <label for="accessibility-high-contrast-check"
                   i18n-content="accessibilityHighContrast">
               </label>
               <span class="controlled-setting-indicator"
                   pref="settings.a11y.high_contrast_enabled">
               </span>
             </span>
           </span>
         </div>
       </div>
       <div id="accessibility-sticky-keys" class="option-name">
         <div class="checkbox">
           <span class="controlled-setting-with-label">
             <input id="accessibility-sticky-keys-check"
-                pref="settings.a11y.sticky_keys_enabled" type="checkbox">
+                   pref="settings.a11y.sticky_keys_enabled" type="checkbox"
+                   metric="Options_AccessibilityStickyKeys">
             <span>
               <label for="accessibility-sticky-keys-check"
                   i18n-content="accessibilityStickyKeys">
               </label>
               <span class="controlled-setting-indicator"
                   pref="settings.a11y.sticky_keys_enabled">
               </span>
             </span>
           </span>
         </div>
       </div>
       <div class="option-name">
         <div class="checkbox">
           <span class="controlled-setting-with-label">
             <input id="accessibility-spoken-feedback-check"
-                pref="settings.accessibility" type="checkbox">
+                   pref="settings.accessibility" type="checkbox"
+                   metric="Options_AccessibilitySpokenFeedback">
             <span>
               <label for="accessibility-spoken-feedback-check"
                   i18n-content="accessibilitySpokenFeedback">
               </label>
               <span class="controlled-setting-indicator"
                   pref="settings.accessibility">
               </span>
             </span>
           </span>
           <div id="accessibility-settings" hidden>
             <button id="accessibility-settings-button"
               i18n-content="accessibilitySettings"></button>
           </div>
         </div>
       </div>
       <div class="option-name">
         <div class="checkbox">
           <span class="controlled-setting-with-label">
             <input id="accessibility-screen-magnifier-check"
-                pref="settings.a11y.screen_magnifier" type="checkbox">
+                   pref="settings.a11y.screen_magnifier" type="checkbox"
+                   metric="Options_AccessibilityScreenMagnifier">
             <span>
               <label for="accessibility-screen-magnifier-check"
                   i18n-content="accessibilityScreenMagnifier">
               </label>
               <span class="controlled-setting-indicator"
                   pref="settings.a11y.screen_magnifier">
               </span>
             </span>
           </span>
         </div>
       </div>
       <div class="option-name" id="accessibility-tap-dragging">
         <div class="checkbox">
           <label>
             <input id="accessibility-tap-dragging-check"
-                pref="settings.touchpad.enable_tap_dragging" type="checkbox">
+                   pref="settings.touchpad.enable_tap_dragging" type="checkbox"
+                   metric="Options_AccessibilityTapDragging">
             <span i18n-content="accessibilityTapDragging"></span>
           </label>
         </div>
       </div>
       <div class="option-name" id="accessibility-autoclick">
         <div class="checkbox">
           <span class="controlled-setting-with-label">
             <input id="accessibility-autoclick-check"
                   pref="settings.a11y.autoclick" type="checkbox">
             <span>
@@ skipping 28 matching lines @@
                 </div>
               </div>
             </span>
           </span>
         </div>
       </div>
       <div class="option_name" id="accessibility_onscreen_keyboard">
         <div class="checkbox">
           <span class="controlled-setting-with-label">
             <input id="accessibility-virtual-keyboard-check"
-                pref="settings.a11y.virtual_keyboard" type="checkbox">
+                   pref="settings.a11y.virtual_keyboard" type="checkbox"
+                   metric="Options_AccessibilityOnScreenKeyboard">
             <span>
               <label for="accessibility-virtual-keyboard-check"
                   i18n-content="accessibilityVirtualKeyboard">
               </label>
               <span class="controlled-setting-indicator"
                   pref="settings.a11y.virtual_keyboard">
               </span>
             </span>
           </span>
         </div>
@@ skipping 57 matching lines @@
     </div>
   </section>
   </div>  <!-- advanced-settings-container -->
   </div>  <!-- advanced-settings -->
   <footer>
     <button id="advanced-settings-expander" class="link-button"
         i18n-content="showAdvancedSettings">
     </button>
   </footer>
   </div>