CrOS - Login Pin/Password Switch Button Strings

Add strings and screenshots for the upcoming switch button on
the login/lock screen.

Bug: 1075994
Change-Id: Ic5aa9b083dc2251edda7ad7a634bf93f17f1981b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346264
Commit-Queue: Renato Silva <rrsilva@google.com>
Auto-Submit: Renato Silva <rrsilva@google.com>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796357}

ash/ash_strings.grd

@@ -1936,6 +1936,12 @@ This file contains the strings for ash.
       <message name="IDS_ASH_LOGIN_POD_PASSWORD_PIN_PLACEHOLDER" desc="Text to display as placeholder in the password field when both password and pin are allowed.">
         PIN or password
       </message>
+      <message name="IDS_ASH_LOGIN_SWITCH_TO_PASSWORD" desc="Text to display on the button that is used for switching between PIN and password authentication">
+        Switch to password
+      </message>
+      <message name="IDS_ASH_LOGIN_SWITCH_TO_PIN" desc="Text to display on the button that is used for switching between PIN and password authentication">
+        Switch to PIN
+      </message>
       <message name="IDS_ASH_LOGIN_POD_PASSWORD_TAP_PLACEHOLDER" desc="Text to display as placeholder in the password field when the user can click/tap their profile picture to unlock.">
         Tap your profile image
       </message>

ash/ash_strings_grd/IDS_ASH_LOGIN_SWITCH_TO_PASSWORD.png.sha1

+11d0c44aa250b377a2c9a0aefb69c80a4d1e1db2
\ No newline at end of file

ash/ash_strings_grd/IDS_ASH_LOGIN_SWITCH_TO_PIN.png.sha1

+a6fdc8379efd1adf0d1c4487d0b48d4ae1903e22
\ No newline at end of file