Add option in about:flags to disable Quickoffice component extension

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>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 122 matching lines @@
   <!-- Chrome OS Strings -->
   <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_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_ECHO_CONSENT_DISMISS_BUTTON" desc="Dismiss dialog button label for disabled echo dialog.">
     Dismiss
   </message>
+  <message name="IDS_FLAGS_DISABLE_QUICKOFFICE_COMPONENT_APP_NAME" desc="Name for the flag to disable Chrome Office Viewer component extension.">
+    Disable Chrome Office Viewer component extension
+  </message>
+  <message name="IDS_FLAGS_DISABLE_QUICKOFFICE_COMPONENT_APP_DESCRIPTION" desc="Description for the flag to disable Chrome Office Viewer component extension.">
+    Disable Chrome Office Viewer component extension for testing purpose.
+  </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.">
@@ skipping 3447 matching lines @@
   <message name="IDS_KIOSK_APP_ERROR_UNABLE_TO_MOUNT" desc="Error message used when a kiosk app fails to launch due to cryptohome error.">
     Kryptonite! The cryptohome for the kiosk application could not be mounted.
   </message>
   <message name="IDS_KIOSK_APP_ERROR_UNABLE_TO_INSTALL" desc="Error message used when a kiosk app fails to launch due to install failure.">
     Kiosk application could not be installed.
   </message>
   <message name="IDS_KIOSK_APP_ERROR_USER_CANCEL" desc="Error message used when a kiosk app launch is canceled by user.">
     Kiosk application launch canceled.
   </message>
 </grit-part>