Upstream the sign out and add an account dialogs.

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 314 matching lines @@
       <message desc="Checkbox allowing users to forgoe an additional prompts from a web page. [CHAR-LIMIT=None]" name="IDS_SUPPRESS_JS_MODAL_DIALOGS">
         Prevent this page from creating additional dialogs
       </message>
       <message desc="Content description for the input javascript modal dialog prompt. [CHAR-LIMIT=32]" name="IDS_ACCESSIBILITY_JS_MODAL_DIALOG_PROMPT">
         Prompt
       </message>
       <message desc="Dialog box title for viewing security certificates. [CHAR-LIMIT=32]" name="IDS_CERTTITLE">
         Certificate Viewer
       </message>
 
+      <!-- Sign-in strings -->
+      <message name="IDS_ADD_ACCOUNT_TITLE" desc="Title for add Google account dialog [CHAR-LIMIT=40]">
+        Add a Google Account
+      </message>
+      <message name="IDS_ADD_ACCOUNT_MESSAGE" desc="Message to display for add Google account dialog">
+        You have not yet set up a Google Account on this device
+      </message>
+      <message name="IDS_ADD_ACCOUNT_CONTINUE" desc="Continue button for add Google account dialog [CHAR-LIMIT=20]">
+        Continue
+      </message>
+      <message name="IDS_SIGNOUT_TITLE" desc="Title for sign out of Chrome dialog [CHAR-LIMIT=40]">
+        Sign out of Chrome
+      </message>
+      <message name="IDS_SIGNOUT_MESSAGE" desc="Message to display for sign out of Chrome dialog">
+        The data stored on this device as well as the data stored in your Google Account will remain in both places. However, new data or changes you make to your data will not be synchronized between them.
+      </message>
+      <message name="IDS_SIGNOUT_MANAGED_ACCOUNT_MESSAGE" desc="Message to display for sign out of Chrome dialog when the account has enterprise management, and all user data will be erased">
+        You are signing out of an account managed by <ph name="DOMAIN_NAME">%1$s<ex>google.com</ex></ph>. This will delete the Chrome data stored on this device, but the data will remain in your Google Account.
+      </message>
+
       <!-- Sync error strings -->
       <message desc="Sync error string for generic error. [CHAR-LIMIT=80]" name="IDS_SYNC_ERROR_GENERIC">
         Sync error
       </message>
       <message desc="Sync error string for when the needs to update the sign-in details [CHAR-LIMIT=80]" name="IDS_SYNC_ERROR_GA">
         Please update your sign-in details.
       </message>
       <message desc="Sync error string for network connection. [CHAR-LIMIT=80]" name="IDS_SYNC_ERROR_CONNECTION">
         Could not connect to the sync server.
       </message>
@@ skipping 324 matching lines @@
 
       <!-- Fullscreen -->
       <message name="IDS_FULLSCREEN_API_NOTIFICATION" desc="Notification message when a site has entered fullscreen and the directions of how to exit.">
         This site has gone fullscreen.
 Drag from top to exit.
       </message>
 
     </messages>
   </release>
 </grit>