Initial CL for Data Saver (Flywheel) prompt when cellular network detected

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="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 5630 matching lines @@
     Chrome's language has changed from "<ph name="FROM_LOCALE">$1<ex>Italian</ex></ph>" to "<ph name="TO_LOCALE">$2<ex>English (United States)</ex></ph>" after syncing your settings.
   </message>
   <message name="IDS_LOCALE_CHANGE_REVERT_MESSAGE" desc="Link to revert a change.">
     Change back to "<ph name="FROM_LOCALE">$1<ex>Italian</ex></ph>" (requires sign-out)
   </message>
 
   <!-- 3G data Notifications -->
   <message name="IDS_3G_NOTIFICATION_MESSAGE" desc="Text of the 3G data notification telling that 3G data is enabled.">
     Google Chrome will use mobile data if you're not connected to another network.
   </message>
+  <message name="IDS_3G_DATASAVER_TITLE" desc="Title of the 3G data notification prompting user to install Data Saver.">
+    You are using mobile data
+  </message>
+  <message name="IDS_3G_DATASAVER_MESSAGE" desc="Text of the 3G data notification prompting user to install Data Saver.">
+    Save data and browse faster using Google Data Saver. Click to learn more.
+  </message>
 
   <!-- chrome://mobilesetup strings -->
   <message name="IDS_MOBILE_SETUP_TITLE" desc="ChromeOS mobile device activation page title">
     Mobile data service management
   </message>
   <message name="IDS_MOBILE_CONNECTING_HEADER" desc="Mobile connection page header while connecting to the provider">
     Connecting to <ph name="PROVIDER_NAME">$1<ex>Acme Mobile</ex></ph>
   </message>
   <message name="IDS_MOBILE_ERROR_HEADER" desc="Mobile connection page header when connection error occur">
     Connection error
@@ skipping 565 matching lines @@
     Enable MTP write support in file manager. Some operations (editing an image on MTP volume) are not supported yet.
   </message>
   <message name="IDS_FILE_SYSTEM_REQUEST_FILE_SYSTEM_NOTIFICATION_MESSAGE" desc="Message in a notification about granted read-only pemissions (read, write, delete, create files and directories) to a volume (eg. USB drive, SD card, MTP device) with the specified name to the extension.">
     Read-only access to <ph name="VOLUME_NAME">$1<ex>FooBar 4GB</ex></ph> has been granted.
   </message>
   <message name="IDS_FILE_SYSTEM_REQUEST_FILE_SYSTEM_NOTIFICATION_WRITABLE_MESSAGE" desc="Message in a notification about granted full permissions (read, write, delete, create files and directories) to a volume (eg. USB drive, SD card, MTP device) with the specified name to the extension.">
     Read and write access to <ph name="VOLUME_NAME">$1<ex>FooBar 4GB</ex></ph> has been granted.
   </message>
 
 </grit-part>