Created the dialog offering the user to merge their account data or keep it

chrome/android/java/strings/android_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- android_chrome_strings.grd contains strings for Chrome for Android.
 
 FAQ:
   - How do I add, change, or remove a string?
       Just update this file.
   - Translations will happen automatically??
       Yes, indeed. Just add your string before the branch point and
       make the description good.
@@ skipping 152 matching lines @@
       </message>
       <message name="IDS_NO_THANKS" desc="Generic label to say no thanks for a feature. [CHAR-LIMIT=32]">
         No Thanks
       </message>
       <message name="IDS_ENABLE" desc="Generic label to enable a feature. [CHAR-LIMIT=32]">
         Enable
       </message>
       <message name="IDS_NEXT" desc="Generic label for a button to advance to the next item. [CHAR-LIMIT=20]">
         Next
       </message>
+      <message name="IDS_CONT" desc="Generic label for a continue prompt. Used in multiple contexts. [CHAR-LIMIT=20]">
+        Continue
+      </message>
       <message name="IDS_SUBMIT" desc="Generic label for a button to submit data. Used in multiple contexts. [CHAR-LIMIT=20]">
         Submit
       </message>
       <message name="IDS_UNDO" desc="Generic label for a button to undo the previous action.">
         Undo
       </message>
 
       <!-- Main Preferences -->
       <message name="IDS_PREFERENCES" desc="Title for Chrome's Settings.">
         Settings
@@ skipping 857 matching lines @@
       </message>
       <message name="IDS_SYNC_PASSPHRASE_INCORRECT" desc="Inform the user that the passphrase they entered for sync is incorrect. [CHAR-LIMIT=40]">
         Incorrect passphrase
       </message>
       <message name="IDS_SYNC_VERIFYING" desc="Inform the user that their sync encryption information is being verified. [CHAR-LIMIT=20]">
         Verifying…
       </message>
       <message name="IDS_SYNC_LOADING" desc="Preference title to let the user change their encryption password. [CHAR-LIMIT=20]">
         Loading…
       </message>
+      <message name="IDS_SYNC_IMPORT_DATA_TITLE" desc="Preference title of screen to let user choose to switch sync accounts. [CHAR-LIMIT=24]">
+        Import data?
+      </message>
+      <message name="IDS_SYNC_IMPORT_DATA_PROMPT" desc="Prompt for the user to choose how they want to handle their existing sync data">
+        You are signing in to <ph name="TO_ACCOUNT">%1$s<ex>johndoe@new.com</ex></ph>. Some of your existing bookmarks, history, passwords, and other settings were previously synced to <ph name="FROM_ACCOUNT">%2$s<ex>johndoe@old.com</ex></ph>. What do you want to do with your existing data?
+      </message>
+      <message name="IDS_SYNC_IMPORT_EXISTING_DATA" desc="Option to import existing data to the newly selected sync account">
+        Import existing data
+      </message>
+      <message name="IDS_SYNC_IMPORT_EXISTING_DATA_SUBTEXT" desc="Subtext describing what happens if the user elects to import existing data to the newly selected sync account">
+        Keep existing data on your device and permanently import the data to <ph name="TO_ACCOUNT">%1$s<ex>johndoe@new.com</ex></ph>.
+      </message>
+      <message name="IDS_SYNC_IMPORT_EXISTING_DATA_VALUE" desc="Internal value for import data preference" translateable="false">
+        import_existing_data
+      </message>
       <message name="IDS_SYNC_KEEP_EXISTING_DATA_SEPARATE" desc="Option to keep the existing data separate from the newly selected sync account">
         Keep existing data separate
       </message>
       <message name="IDS_SYNC_KEEP_EXISTING_DATA_SEPARATE_SUBTEXT" desc="Subtext describing what happens if the user elects to keep the existing data separate">
-        Replace this device’s data with <ph name="ACCOUNT">%1$s<ex>john@doe.com</ex></ph>'s data. You can retrieve your existing data by switching back to <ph name="ACCOUNT">%1$s<ex>johndoe@gmail.com</ex></ph>
+        Replace this device's data with <ph name="TO_ACCOUNT">%1$s<ex>johndoe@new.com</ex></ph>'s data. You can retrieve your existing data by switching back to <ph name="FROM_ACCOUNT">%2$s<ex>johndoe@old.com</ex></ph>, but data created since you signed out will be lost.

[May, 2016/02/17 14:22:11]

Keep the curly apostrophes

[PEConn, 2016/02/18 17:20:48]

Done.

       </message>
       <message name="IDS_SYNC_KEEP_EXISTING_DATA_SEPARATE_VALUE" desc="Internal value for keep existing data preference" translateable="false">
         keep_existing_data
       </message>
 
       <!-- Bluetooth Picker UI strings -->
       <message name="IDS_BLUETOOTH_DIALOG_TITLE" desc="The header message shown on top of the dialog that lets the user pick a Bluetooth device for the site to pair with. Shown above a list of Bluetooth devices discovered. ">
         <ph name="SITE">%1$s<ex>https://www.google.com</ex></ph> wants to <ph name="BEGIN_LINK">&lt;link&gt;</ph>pair with<ph name="END_LINK">&lt;/link&gt;</ph>:</message>
       <message name="IDS_BLUETOOTH_SEARCHING" desc="The message shown in the Bluetooth picker dialog while scanning for devices.">
         Searching for devices…
@@ skipping 559 matching lines @@
       <message name="IDS_FRE_SETTINGS" desc="Button that opens Chrome settings">
         Settings
       </message>
       <message name="IDS_FRE_ADD_ACCOUNT" desc="Text for adding another Google Account">
         Add account
       </message>
       <message name="IDS_MAKE_CHROME_YOURS" desc="Title for the signin promo that prompts the user to sign in to Chrome to have a personalized experirence. [CHAR-LIMIT=24]">
         Make Chrome yours
       </message>
       <message name="IDS_FRE_NO_ACCOUNT_CHOICE_DESCRIPTION" desc="Text for account chooser page when there are no accounts on the device.">
-        Add an account to get your bookmarks, history, passwords, and other settings on all your devices.
+        Add an account to get your bookmarks, history, passwords, and other settings on all your devices
       </message>
       <message name="IDS_SIGN_IN_TO_CHROME_SUMMARY_VARIANT" desc="A variant of summary for the signin promo; lists reasons to sign in to Chrome.">
         Sign in to access all your web stuff from any device
       </message>
       <message name="IDS_FRE_NO_ACCOUNTS" desc="Text for spinner when there is no google accounts [CHAR-LIMIT=40]">
         Add an account
       </message>
       <message name="IDS_FRE_HI_NAME" desc="Title welcoming the user by their name after they have signed in.">
         Hi, <ph name="FULL_NAME">%1$s<ex>John Smith</ex></ph>
       </message>
@@ skipping 709 matching lines @@
       </message>
       <message name="IDS_PHYSICAL_WEB_LAUNCH_BUTTON" desc="The label for a button that opens a list of nearby URLs">
         See what's nearby
       </message>
       <message name="IDS_PHYSICAL_WEB_BOTTOM_BAR" desc="A message displayed in the nearby URLs list activity informing the user that a notification will appear whenever devices broadcasting URLs are nearby">
         Future nearby Physical Web pages will show up in your notifications list
       </message>
     </messages>
   </release>
 </grit>