MD Settings: Add Hotword (OK Google) section to search_page

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_DETAILED_BUILD_INFO" desc="Label describing the section that shows detailed information about the current Chrome build.">
       Detailed build information
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_ARC_VERSION" desc="Label for ARC version">
       ARC Version
@@ skipping 1559 matching lines @@
   </message>
   <message name="IDS_SETTINGS_SEARCH_MANAGE_SEARCH_ENGINES" desc="Label for the Manage Search Engines button.">
     Manage search engines
   </message>
   <message name="IDS_SETTINGS_SEARCH_MANAGE_SEARCH_ENGINES_DESCRIPTION" desc="Description label for the Manage Search Engines button.">
     Add, edit, or remove search engines
   </message>
   <message name="IDS_SETTINGS_SEARCH_OK_GOOGLE_LABEL" desc="Label for the checkbox which enables the OK Google hotword.">
     Enable "Ok Google" to start a voice search.
   </message>
-  <message name="IDS_SETTINGS_SEARCH_OK_GOOGLE_LEARN_MORE_LINK" desc="Link which opens page to learn more about the OK Google hotword.">
-    Learn more
+  <message name="IDS_SETTINGS_SEARCH_OK_GOOGLE_SUBTEXT_ALWAYS_ON" desc="Subtext describing when the OK Google hotword may be used.">
+    Say "Ok Google" when the screen is on and unlocked.
   </message>
-  <message name="IDS_SETTINGS_SEARCH_OK_GOOGLE_DESCRIPTION_LABEL" desc="Label describing when the OK Google hotword may be used.">
-    Say "Ok Google" in a new tab and google.com
+  <if expr="chromeos">
+    <message name="IDS_SETTINGS_SEARCH_OK_GOOGLE_SUBTEXT_NO_HARDWARE" desc="Subtext describing when the OK Google hotword may be used for devices without hardware support.">
+      Say "Ok Google" in a new tab, google.com, and the App Launcher
+    </message>
+  </if>
+  <if expr="not chromeos">
+    <message name="IDS_SETTINGS_SEARCH_OK_GOOGLE_SUBTEXT_NO_HARDWARE" desc="Subtext describing when the OK Google hotword may be used for devices with no hardware support.">
+      Say "Ok Google" in a new tab and google.com
+    </message>
+  </if>
+  <message name="IDS_SETTINGS_SEARCH_OK_GOOGLE_LEARN_MORE" desc="In Search Settings, the text for the 'learn more' link next to the OK Google hotword enable checkbox.">
+    Learn more.
+  </message>
+  <message name="IDS_SETTINGS_SEARCH_OK_GOOGLE_AUDIO_HISTORY_LABEL" desc="Text to display when the user has audio history enabled.">
+    Voice and Audio Activity for <ph name="USER_EMAIL">$1<ex>joe@gmail.com</ex></ph>.
+  </message>
+  <message name="IDS_SETTINGS_SEARCH_OK_GOOGLE_AUDIO_HISTORY_SUBTEXT" desc="Subtext describing why audio history is enabled.">
+    Enabled (required to use "Ok Google")
+  </message>
+  <message name="IDS_SETTINGS_SEARCH_OK_GOOGLE_RETRAIN" desc="Text for button to retrain the OK Google hotword voice model.">
+    Retrain
   </message>
 
   <!-- Search Engines Page -->
   <message name="IDS_SETTINGS_SEARCH_ENGINES" desc="Name of the settings page which manages search engines.">
     Search Engines
   </message>
   <message name="IDS_SETTINGS_SEARCH_ENGINES_ADD_SEARCH_ENGINE" desc="Title for a dialog that allows adding a new search engine.">
     Add search engine
   </message>
   <message name="IDS_SETTINGS_SEARCH_ENGINES_EDIT_SEARCH_ENGINE" desc="Title for a dialog that allows editing an existing search engine.">
@@ skipping 1085 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>