Add settings for keyboard auto-repeat to options page.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
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     Escape
   </message>
   <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_SEND_FUNCTION_KEYS"
            desc="The checkbox label for a setting to interpret the top-row keys as function keys instead.">
     Treat top-row keys as function keys
   </message>
   <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_SEND_FUNCTION_KEYS_DESCRIPTION"
            desc="A label describing how to use the top-row keys' original actions when the treat-as-function-keys setting is enabled.">
     Hold the Search key to switch the behavior of the top-row keys.
   </message>
+  <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_AUTO_REPEAT_ENABLE"
+           desc="The checkbox label for enabling keyboard auto-repeat.">
+    Enable auto-repeat
+  </message>
+  <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_AUTO_REPEAT_DELAY"
+           desc="The label for the slider for the delay before auto-repeat begins. The delay is the amount of time a key must be held down before auto-repeating begins.">
+    Delay before repeat:
+  </message>
+  <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_AUTO_REPEAT_DELAY_LONG"
+           desc="The label for the beginning of the auto-repeat delay slider, representing a long delay.">
+    Long
+  </message>
+  <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_AUTO_REPEAT_DELAY_SHORT"
+           desc="The label for the end of the auto-repeat delay slider, representing a short delay.">
+    Short
+  </message>
+  <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_AUTO_REPEAT_RATE"
+           desc="The label for the slider for the auto-repeat rate. The rate is how many times a key repeats per second once auto-repeating has begun.">
+    Repeat rate:
+  </message>
+  <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_AUTO_REPEAT_RATE_SLOW"
+           desc="The label for the beginning of the auto-repeat rate slider, representing a slow repeat rate.">
+    Slow
+  </message>
+  <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_AUTO_REPEAT_RATE_FAST"
+           desc="The label for the end of the auto-repeat rate slider, representing a fast repeat rate.">
+    Fast
+  </message>
   <message name="IDS_OPTIONS_SETTINGS_CHANGE_LANGUAGE_AND_INPUT_SETTINGS"
            desc="The link to open 'Language and input settings' window.">
     Change language and input settings
   </message>
   <message name="IDS_OPTIONS_SETTINGS_SHOW_KEYBOARD_SHORTCUTS"
            desc="The link to open the keyboard overlay.">
     View keyboard shortcuts
   </message>
   <message name="IDS_OPTIONS_NO_POINTING_DEVICES" desc="Text shown when there is neither a touchpad nor a mouse.">
     No mouse or touchpad was detected.
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   </message>
 
   <!-- 'OK Google' voice search activation display strings -->
   <message name="IDS_FLAGS_OK_GOOGLE_NAME" desc="Name of about:flags option for Ok Google.">
     Enable 'Ok Google' to activate voice search.
   </message>
   <message name="IDS_FLAGS_OK_GOOGLE_DESCRIPTION" desc="Description of about:flags option Ok Google.">
     If enabled, there will be an option in chrome:settings to enable saying 'Ok Google' to activate voice search.
   </message>
 </grit-part>