MD Settings/About: Implement update progress percentage

chrome/app/settings_strings.grdp

Index: chrome/app/settings_strings.grdp
diff --git a/chrome/app/settings_strings.grdp b/chrome/app/settings_strings.grdp
index b050a615600ac506c977c809d5372164df2e51e0..071391f2d353dd93e46966d903a3200577694432 100644
--- a/chrome/app/settings_strings.grdp
+++ b/chrome/app/settings_strings.grdp
@@ -40,13 +40,13 @@
       Relaunch and Powerwash
     </message>
     <message name="IDS_SETTINGS_UPGRADE_UPDATING" desc="Status label: Updating ChromiumOS or ChromeOS">
-      Updating your device
+      Updating your device (<ph name="PROGRESS_PERCENT">$1<ex>90%</ex></ph>)
     </message>
     <message name="IDS_SETTINGS_UPGRADE_SUCCESSFUL_RELAUNCH" desc="Status label: Successfully updated ChromiumOS/ChromeOS">
       Nearly up to date! Restart your device to finish updating.
     </message>
     <message name="IDS_SETTINGS_UPGRADE_UPDATING_CHANNEL_SWITCH" desc="Status label: Updating ChromiumOS/ChromeOS to a specified channel">
-      Updating your device to <ph name="CHANNEL_NAME">$1<ex>stable</ex></ph> channel
+      Updating your device to <ph name="CHANNEL_NAME">$1<ex>stable</ex></ph> channel (<ph name="PROGRESS_PERCENT">$2<ex>90%</ex></ph>)
     </message>
     <message name="IDS_SETTINGS_UPGRADE_SUCCESSFUL_CHANNEL_SWITCH" desc="Status label: Channel was successfully switched on ChromiumOS/ChromeOS">
       Channel changed. Restart your device to apply changes.