Add a dialog for getting user consent in the echo redeem flow.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="pp_ifdef('chromeos')">. -->
 <grit-part>
   <!-- Idle Logout Dialog Strings -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog">
     Are you still there?
   </message>
   <message name="IDS_IDLE_LOGOUT_WARNING_RESTART" desc="Restart label for the idle logout dialog">
     This computer will reset in <ph name="LOGOUT_TIME_LEFT">$1<ex>20</ex></ph> seconds.
@@ skipping 111 matching lines @@
     OK
   </message>
   <message name="IDS_IMAGEBURN_CANCEL_BUTTON" desc="Text on the button that cancels download">
     Cancel
   </message>
   <message name="IDS_IMAGEBURN_RETRY_BUTTON" desc="Text on the button that triggers burn restart">
     Try again
   </message>
 
   <!-- Chrome OS Strings -->
-  <message name="IDS_OFFERS_CONSENT_INFOBAR_LABEL_ALT" desc="Butter bar text when prompting user for sending coupon code. Prefixed with the site name.">
-    wants to confirm you are browsing on a Chrome OS device by requesting Google to verify your coupon code.
+  <message name="IDS_ECHO_CONSENT_DIALOG_TEXT" desc="Dialog text shown when user is asked to give consent to proceed with redeeming ECHO offer.">
+    <ph name="SERVICE_NAME">$1<ex>Google Drive</ex></ph> wants to verify that you are using an eligible Chrome OS device. <ph name="MORE_INFO_LINK">$2<ex>More info</ex></ph>
   </message>
-  <message name="IDS_OFFERS_CONSENT_INFOBAR_LABEL" desc="Butter bar text when prompting user for sending coupon code. Prefixed with the site name.">
-    wants to confirm you are browsing on a Chrome OS device.
+  <message name="IDS_ECHO_DISABLED_CONSENT_DIALOG_TEXT" desc="Dialog text shown when user is informed that redeeming offers is disabled for the device.">
+    Your IT administrator has disabled Chrome Goodies for your device. <ph name="MORE_INFO_LINK">$1<ex>More info</ex></ph>
   </message>
-  <message name="IDS_OFFERS_CONSENT_INFOBAR_LABEL_LEARN_MORE" desc="Text of the Learn More link on the offer butter bar.">
+  <message name="IDS_ECHO_CONSENT_DISMISS_BUTTON" desc="Dismiss dialog button label for disabled echo dialog.">
+    Dismiss
+  </message>
+  <message name="IDS_OFFERS_CONSENT_INFOBAR_LABEL_LEARN_MORE" desc="Text of the Learn More link in the echo dialog.">
     Learn More
   </message>
   <message name="IDS_OFFERS_CONSENT_INFOBAR_ENABLE_BUTTON" desc="Enable button label.">
     Allow
   </message>
   <message name="IDS_OFFERS_CONSENT_INFOBAR_DISABLE_BUTTON" desc="Disable button label.">
     Deny
   </message>
   <message name="IDS_NETWORK_CONFIG_ERROR_INCORRECT_PASSWORD" desc="Error for network configuration: Incorrect password.">
     Incorrect password
@@ skipping 3392 matching lines @@
   <message name="IDS_LOGIN_PUBLIC_ACCOUNT_SIGNOUT_REMINDER" desc="Text shown in the public account user pod, reminding the user to log out.">
     Your information will be removed when you sign out.
   </message>
   <message name="IDS_LOGIN_PUBLIC_ACCOUNT_ENTER" desc="Label text for the sign-in button in the public account user pod.">
     Enter
   </message>
   <message name="IDS_LOGIN_PUBLIC_ACCOUNT_ENTER_ACCESSIBLE_NAME" desc="Text to be spoken when focus is set to the sign-in button in the public account user pod.">
     Enter public session
   </message>
 </grit-part>