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 button to continue to the next screen. Used in multiple contexts. [CHAR-LIMIT=20]">

[newt (away), 2016/02/25 18:01:32]

Ah, since we can't we "IDS_CONTINUE", how about "IDS_CONTINUE_BUTTON"?

[PEConn, 2016/02/25 20:45:12]

Done.

+        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 879 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_SWITCHING_ACCOUNTS" desc="Prompt for the user to choose how they want to handle their existing sync data">
+        You’re switching sync accounts from <ph name="FROM_ACCOUNT">%2$s<ex>johndoe@old.com</ex></ph> to <ph name="TO_ACCOUNT">%1$s<ex>johndoe@new.com</ex></ph>. What do you want to do with your existing bookmarks, history, passwords and other settings?
+      </message>
+      <message name="IDS_SYNC_IMPORT_DATA_PROMPT_EXISTING_DATA" 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?

[Bernhard Bauer, 2016/02/25 14:52:43]

This still uses "you are", but the one above uses "you're". Should we unify
these?

[PEConn, 2016/02/25 20:45:12]

I passed this on to Eli.

+      </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$s<ex>johndoe@new.com</ex></ph>.
+      </message>
       <message name="IDS_SYNC_KEEP_EXISTING_DATA_SEPARATE" desc="Option to keep the existing data separate from the newly selected sync account">
         Keep existing data separate
       </message>
       <message name="IDS_SYNC_KEEP_EXISTING_DATA_SEPARATE_SUBTEXT" desc="Subtext describing what happens if the user elects to keep the existing data separate">
-        Replace this device’s data with <ph name="ACCOUNT">%1$s<ex>john@doe.com</ex></ph>’s data. You can retrieve your existing data by switching back to <ph name="ACCOUNT">%1$s<ex>johndoe@gmail.com</ex></ph>
-      </message>
-      <message name="IDS_SYNC_KEEP_EXISTING_DATA_SEPARATE_VALUE" desc="Internal value for keep existing data preference" translateable="false">
-        keep_existing_data
+        Replace this device’s data with <ph name="TO_ACCOUNT">%1$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.
       </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 pair with:</message>
       <message name="IDS_BLUETOOTH_SEARCHING" desc="The message shown in the Bluetooth picker dialog while scanning for devices.">
         Searching for devices… <ph name="BEGIN_LINK">&lt;link&gt;</ph>get help<ph name="END_LINK">&lt;/link&gt;</ph>
       </message>
       <message name="IDS_BLUETOOTH_CONFIRM_BUTTON" desc="The button to confirm association of a website with a Bluetooth device. Use the same term as in 'Pair this Bluetooth headset with your phone.'">
         Pair
@@ skipping 531 matching lines @@
         Critical functionality required to run Chrome is missing; either your Chrome installation is incomplete, or not compatible with this version of Android.
       </message>
       <message name="IDS_INCOMPATIBLE_LIBRARIES" desc="Error message shown when Chrome fails to start due to having the wrong version of the native library">
         Chrome’s components are incompatible with one another. Chrome may be upgrading, please try again in a few minutes. If the problem continues, try uninstalling and re-installing Chrome.
       </message>
       <message name="IDS_NATIVE_STARTUP_FAILED" desc="Error message shown when Chrome fails to start for other (unknown) reasons">
         Chrome failed during startup with an unexpected error.
       </message>
 
       <!-- First Run strings -->
-      <message name="IDS_FRE_SET_UP_CHROME" desc="Header text shown when the user is first setting up Chrome">
-        Set up Chrome
-      </message>
-      <message name="IDS_FRE_ACCOUNT_CHOICE_DESCRIPTION" desc="Text for account chooser page">
-        Sign in to get your bookmarks, history, passwords, and other settings on all your devices.
-      </message>
-      <message name="IDS_FRE_ACCEPT" desc="Text for button to accept being signed in">
-        OK, got it
-      </message>
       <message name="IDS_FRE_SKIP_TEXT" desc="Text for second page skip button">
         No thanks
       </message>
-      <message name="IDS_CHOOSE_ACCOUNT_SIGN_IN" desc="Sign in button for choose google account dialog [CHAR-LIMIT=20]">
-        Sign in
-      </message>
       <message name="IDS_FRE_DONE" desc="Button to dismiss the sign-in screen once the user is done">
         Done
       </message>
       <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.
-      </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>
-      <message name="IDS_FRE_SIGNED_IN_DESCRIPTION" desc="Explanation of what gets synced after the user signed in">
-        Your bookmarks, history, passwords, and other settings will be synced to your Google Account so you can use them on all your devices. You can choose what to sync in <ph name="BEGIN_LINK1">&lt;LINK1&gt;</ph>Settings<ph name="END_LINK1">&lt;/LINK1&gt;</ph>.
-      </message>
-      <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_FRE_TOS_AND_PRIVACY" desc="Message explaining that use of Chrome is governed by Chrome's terms of service and privacy notice.">
         By using this application, you agree to Chrome’s <ph name="BEGIN_LINK1">&lt;LINK1&gt;</ph>Terms of Service<ph name="END_LINK1">&lt;/LINK1&gt;</ph> and <ph name="BEGIN_LINK2">&lt;LINK2&gt;</ph>Privacy Notice<ph name="END_LINK2">&lt;/LINK2&gt;</ph>.
       </message>
       <message name="IDS_FRE_SEND_REPORT_CHECK" desc="Text for asking the user to allow sending stats and crash reports">
         Help make Chrome better by sending usage statistics and crash reports to Google.
       </message>
       <message name="IDS_FRE_ACCEPT_CONTINUE" desc="Text for first page accept and continue button [CHAR-LIMIT=20]">
         Accept &amp; continue
       </message>
       <message name="IDS_FRE_WELCOME" desc="Text for greeting the user on Chrome First Run">
         Welcome to Chrome
       </message>
-      <message name="IDS_ACCESSIBILITY_FRE_ACCOUNT_SPINNER" desc="Content description for the first run account drop down spinner.">
+
+      <!-- Account Signin Strings -->
+      <message name="IDS_SIGNIN_SET_UP_CHROME" desc="Header text shown when the user is first setting up Chrome">
+        Set up Chrome
+      </message>
+      <message name="IDS_CHOOSE_ACCOUNT_SIGN_IN" desc="Sign in button for choose google account dialog [CHAR-LIMIT=20]">
+        Sign in
+      </message>
+      <message name="IDS_SIGNIN_ACCOUNT_CHOICE_DESCRIPTION" desc="Text for account chooser page">
+        Sign in to get your bookmarks, history, passwords, and other settings on all your devices.
+      </message>
+      <message name="IDS_SIGNIN_ACCEPT" desc="Text for button to accept being signed in">
+        OK, got it
+      </message>
+      <message name="IDS_SIGNIN_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_SIGNIN_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.
+      </message>
+      <message name="IDS_SIGNIN_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_SIGNIN_NO_ACCOUNTS" desc="Text for spinner when there is no google accounts [CHAR-LIMIT=40]">
+        Add an account
+      </message>
+      <message name="IDS_SIGNIN_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>
+      <message name="IDS_SIGNIN_SIGNED_IN_DESCRIPTION" desc="Explanation of what gets synced after the user signed in">
+        Your bookmarks, history, passwords, and other settings will be synced to your Google Account so you can use them on all your devices. You can choose what to sync in <ph name="BEGIN_LINK1">&lt;LINK1&gt;</ph>Settings<ph name="END_LINK1">&lt;/LINK1&gt;</ph>.
+      </message>
+      <message name="IDS_SIGNIN_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_SIGNIN_ACCOUNT_SPINNER" desc="Content description for the first run account drop down spinner.">
         Choose account
       </message>
 
       <!-- External Navigation Strings -->
       <message name="IDS_EXTERNAL_APP_LEAVE_INCOGNITO_WARNING" desc="Alert dialog text warning that user that incognito mode does not continue into external apps.">
         Leaving incognito mode if this link is opened in an external application. Continue?
       </message>
       <message name="IDS_EXTERNAL_APP_LEAVE_INCOGNITO_WARNING_TITLE" desc="Title for incognito external intent. [CHAR-LIMIT=24]">
         Warning
       </message>
@@ skipping 683 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>