Add an infobar if a session is being controlled by an automated test.

chrome/app/chromium_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are distribution specific.
 If you update this file, be sure also to update google_chrome_strings.grd. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/chromium_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
@@ skipping 1229 matching lines @@
         <message name="IDS_WIN10_WELCOME_MAKE_DEFAULT_SUBHEADING" desc="A subheading on a section which gives instructions on how to make Chromium the default browser.">
           Make Chromium your default browser
         </message>
         <message name="IDS_WIN10_WELCOME_PIN_SUBHEADING" desc="A subheading on a section which gives instructions on how to pin Chromium to the Windows 10 taskbar.">
           Pin Chromium to your taskbar
         </message>
         <message name="IDS_WIN10_WELCOME_SELECT" desc="An instruction asking the user to select Chromium from an external list of apps.">
           Select <ph name="SMALL_PRODUCT_LOGO">&lt;div class="logo-small"&gt;&lt;/div&gt;</ph> <ph name="BEGIN_BOLD">&lt;strong&gt;</ph>Chromium<ph name="END_BOLD">&lt;/strong&gt;</ph>
         </message>
       </if>
+
+      <!-- ChromeDriver info bar -->
+      <message name="IDS_CONTROLLED_BY_CHROMEDRIVER" desc="Message shown when the browser session is being controlled by ChromeDriver. This message is followed by a 'Learn more' link.">
+        Your browser is being remotely controlled by ChromeDriver.

[Devlin, 2017/02/01 23:04:59]

we have a generated_resources.grd file for strings that don't need to be
different between Chrome and Chromium.

[samuong, 2017/02/04 00:11:03]

Done.

+      </message>
     </messages>
   </release>
 </grit>