Add auto sign in slider in Clank settings.

chrome/android/java/strings/android_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit current_release="1" latest_public_release="0">
   <outputs>
     <output filename="values-am/android_chrome_strings.xml" lang="am" type="android" />
     <output filename="values-ar/android_chrome_strings.xml" lang="ar" type="android" />
     <output filename="values-bg/android_chrome_strings.xml" lang="bg" type="android" />
     <output filename="values-ca/android_chrome_strings.xml" lang="ca" type="android" />
     <output filename="values-cs/android_chrome_strings.xml" lang="cs" type="android" />
     <output filename="values-da/android_chrome_strings.xml" lang="da" type="android" />
     <output filename="values-de/android_chrome_strings.xml" lang="de" type="android" />
@@ skipping 208 matching lines @@
         After you authenticate a card, Chrome will cache it locally.
       </message>
       <message name="IDS_AUTOFILL_WALLET_CLEAR_UNMASKED_CARDS" desc="Text for button that allows user to clear Wallet card cache.">
         Clear cache
       </message>
       <message name="IDS_AUTOFILL_MANAGE_WALLET_CARDS_URL" desc="URL for managing wallet credit cards" translateable="false">
         https://wallet.google.com/manage/w/0/paymentMethods
       </message>
 
       <!-- Save passwords preferences -->
+      <message name="IDS_PASSWORDS_AUTO_SIGNIN_TITLE" desc="Title for 'Auto sign-in' checkbox in the password dialog">

[newt (away), 2015/03/11 17:41:40]

"Title for checkbox to enable automatically signing the user in to websites."

[melandory, 2015/03/16 15:10:27]

Done.

+        Auto Sign-in
+      </message>
+      <message name="IDS_PASSWORDS_AUTO_SIGNIN_DESCRIPTION" desc="Text under 'Auto sign-in' checkbox">
+       Automatically sign in to websites using stored credential. When the feature is off, you'll be asked for verification every time before signing in to a website.

[newt (away), 2015/03/11 17:41:40]

s/credential/credentials ? Where did this string come from?

[melandory, 2015/03/16 15:10:27]

It's slightly modified string from mocks. Original string was saying: 
"Automatically sign in to apps and websites connected to your Account."

"Account" was removed because it restricts this feature only to sync users.
Desktop settings UI uses same string.

+      </message>
       <message name="IDS_PREFS_SAVED_PASSWORDS" desc="Title for the Saved Passwords preferences. [CHAR-LIMIT=32]">

[newt (away), 2015/03/11 17:41:40]

nit: move "Save passwords" string above the new strings

[melandory, 2015/03/16 15:10:27]

Done.

         Save passwords
       </message>
       <message name="IDS_SECTION_SAVED_PASSWORDS" desc="Header for the list of passwords that have been saved in Chrome. [CHAR-LIMIT=32]">
         Passwords
       </message>
       <message name="IDS_SECTION_SAVED_PASSWORDS_EXCEPTIONS" desc="Header for the list of websites for which user selected to never save passwords. [CHAR-LIMIT=32]">
         Never saved
       </message>
       <message name="IDS_MANAGE_PASSWORDS_TEXT" desc="Text for link to manage passwords on Account Central.">
         Manage saved passwords in your <ph name="BEGIN_LINK">&lt;link&gt;</ph>Google Account<ph name="END_LINK">&lt;/link&gt;</ph>
@@ skipping 1067 matching lines @@
       <message name="IDS_FRE_SIGNED_IN_DESCRIPTION_UCA_ADDENDUM" desc="Additional explanation for child accounts that synced settings are managed by parents.">
         Your parents help manage these settings.
       </message>
       <message name="IDS_ACCESSIBILITY_FRE_ACCOUNT_SPINNER" desc="Content description for the first run account drop down spinner.">
         Choose account
       </message>
 
     </messages>
   </release>
 </grit>