Add a flag for enabling Chrome Web Store Gallery widget app

chrome/app/chromeos_strings.grdp

Index: chrome/app/chromeos_strings.grdp
diff --git a/chrome/app/chromeos_strings.grdp b/chrome/app/chromeos_strings.grdp
index 3bc4c563a11138629c19bc939a05378a72d0807b..2bdd57fc1fdedda994c4397ac2c6d1c169834454 100644
--- a/chrome/app/chromeos_strings.grdp
+++ b/chrome/app/chromeos_strings.grdp
@@ -6359,5 +6359,11 @@ All users must sign out to continue.
   <message name="IDS_WEBSTORE_WIDGET_DEFAULT_ERROR" desc="Default message shown when Chrome Web Store Widget app window content fails to load (e.g. if it fails to load Chrome Web Store Gallery in a webview).">
     Could not connect to the Chrome Web Store.
   </message>
+  <message name="IDS_FLAGS_PRINTER_PROVIDER_SEARCH_APP_NAME" desc="Name of the flag used to enable launching Chrome Web Store Gallery widget app for searching for printer provider apps.">
+    Chrome Web Store Gallery app for printer drivers
+  </message>
+  <message name="IDS_FLAGS_PRINTER_PROVIDER_SEARCH_APP_DESCRIPTION" desc="Description of a flag in chrome://flags that enables launching Chrome Web Store Gallery widget app for searching for printer provider apps.">
+    Enables Chrome Web Store Gallery app for printer drivers. The app searches Chrome Web Store for extensions that support printing to a USB printer with specific USB ID.
+  </message>
 
 </grit-part>