Site Settings Desktop: Implement protocol handler section.

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- About Page -->
   <if expr="chromeos">
     <message name="IDS_SETTINGS_ABOUT_PAGE_CHECK_FOR_UPDATES" desc="The button label to check for updates and apply (download and install) if found">
       Check for updates
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_CURRENT_CHANNEL_STABLE" desc="The stable label in the message about current channel.">
       stable
@@ skipping 960 matching lines @@
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_BACKGROUND_SYNC" desc="Label for the background sync site settings.">
     Background sync
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_CAMERA" desc="Label for the camera site settings.">
     Camera
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_COOKIES" desc="Label for the cookies site settings.">
     Cookies
   </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLERS" desc="Label for the protocol handlers (e.g. mailto) in site settings.">
+    Handlers
+  </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_LOCATION" desc="Label for the location site settings.">
     Location
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_KEYGEN" desc="Label for the key generation site settings.">
     Key generation
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_MIC" desc="Label for the microphone site settings.">
     Microphone
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_NOTIFICATIONS" desc="Label for notifications sites site settings.">
@@ skipping 64 matching lines @@
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_BACKGROUND_SYNC_ALLOW_RECENTLY_CLOSED_SITES" desc="The allow label for background sync in site settings.">
     Allow recently closed sites to finish sending and receiving data
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_BACKGROUND_SYNC_ALLOW_RECENTLY_CLOSED_SITES_RECOMMENDED" desc="The allow label for background sync in site settings (with the 'recommended' suffix).">
     Allow recently closed sites to finish sending and receiving data (recommended)
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_BACKGROUND_SYNC_BLOCKED" desc="The block label for background sync in site settings.">
     Do not allow recently closed sites to finish sending and receiving data
   </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLERS_ASK" desc="The allow label for protocol handlers in site settings.">
+    Allow sites to ask to become default handlers for protocols
+  </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLERS_ASK_RECOMMENDED" desc="The allow label for protocol handlers in site settings (with the 'recommended' suffix).">
+    Allow sites to ask to become default handlers for protocols (recommended)
+  </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLERS_BLOCKED" desc="The block label for protocol handlers in site settings.">
+    Do not allow any site to handle protocols
+  </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_KEYGEN_ALLOW" desc="The allow label for keygen in site settings.">
     Allow all sites to use key generation in forms
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_KEYGEN_BLOCK" desc="The block label for key generation in site settings.">
     Do not allow any site to use key generation in forms
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_KEYGEN_BLOCK_RECOMMENDED" desc="The block label for key generation in site settings (with the 'recommended' suffix).">
     Do not allow any site to use key generation in forms (recommended)
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_AUTOMATIC_DOWNLOAD_ASK" desc="The allow label for automatic download in site settings.">
@@ skipping 67 matching lines @@
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_DELETE" desc="Label for the trashcan icon used to delete storage on the Site Details page.">
     Delete
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_THIRD_PARTY_COOKIE" desc="Label for the Block 3rd-party cookie checkbox on the Cookies category.">
     Block third-party cookies.
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_THIRD_PARTY_COOKIE_SUBLABEL" desc="A sub-label below the Block 3rd-party cookie checkbox.">
     Prevent third-party websites from saving and reading cookie data.
   </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLER_IS_DEFAULT" desc="A label showing that a certain handler for a given protocol is the default.">
+    Default
+  </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLER_SET_DEFAULT" desc="A label for the action of making a certain handler the default for a given protocol.">
+    Set as default
+  </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_REMOVE" desc="A label for the action of removing (deleting) a certain handler.">
+    Remove
+  </message>
 
   <!-- Sync / People Page -->
   <message name="IDS_SETTINGS_PEOPLE" desc="Name of the settings page which manages Chrome's signed-in Google profile.">
     People
   </message>
   <message name="IDS_SETTINGS_PEOPLE_MANAGE_OTHER_PEOPLE" desc="Label for the button that opens the multi-profile user manager.">
     Manage other people
   </message>
   <message name="IDS_SETTINGS_PEOPLE_MANAGE_SUPERVISED_USERS" desc="Label for the button that opens the supervised users dashboard.">
     Manage supervised users
@@ skipping 471 matching lines @@
       System
     </message>
     <message name="IDS_SETTINGS_SYSTEM_HARDWARE_ACCELERATION_LABEL" desc="Label for the checkbox that forces Chrome to render via hardware acceleration (GPU) when available.">
       Use hardware acceleration when available
     </message>
     <message name="IDS_SETTINGS_SYSTEM_PROXY_SETTINGS_BUTTON" desc="Text for the button that changes a user's network proxy settings.">
       Change proxy settings
     </message>
   </if>
 </grit-part>