Disable background video track behind a feature flag

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index bf7ecf763b6412cc13e4bc2e6dc8983ab8a5d26b..21e4a4b2c250e5bb2559f5de8796171b158a9ce7 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -9922,13 +9922,13 @@ I don't think this site should be blocked!
         <message name="IDS_OPTIONS_EXTENSION_PROXIES_LABEL" desc="The info label for the 'Proxy settings' button when managed by an extension.">
           Your network proxy settings are being managed by an extension.
         </message>
-        
+
         <if expr="chromeos">
           <message name="IDS_OPTIONS_ADVANCED_SECTION_TITLE_CUPS_PRINT" desc="The title for the section of CUPS Print in Chrome OS advanced settings.">
             Printers
           </message>
           <message name="IDS_OPTIONS_ADVANCED_SECTION_CUPS_PRINT_LABEL" desc="Label for the CUPS Print section in Chrome OS advanced settings.">
-            Set up or manage local printers. 
+            Set up or manage local printers.
           </message>
           <message name="IDS_OPTIONS_ADVANCED_SECTION_CUPS_PRINT_MANAGE_BUTTON" desc="Text on the button to take the user to Chrome settings page of CUPS printers.">
             Manage
@@ -14901,7 +14901,7 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@gmail.com</ex
         </message>
         <message name="IDS_PRINTER_DETECTED_NOTIFICATION_SET_UP_GET_HELP_BUTTON" desc="Content for the notification button to direct the user to the chrome://setting CUPS printers subpage if the setup process is failed.">
           Get help
-        </message> 
+        </message>
       </if>
 
       <!-- Strings for ARC intent picker -->
@@ -15015,7 +15015,7 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@gmail.com</ex
         Enables badging of offline pages on the New Tab page. Only relevant if offline pages are enabled.
       </message>
       <message name="IDS_FLAGS_OFFLINE_PAGES_ASYNC_DOWNLOAD_NAME" desc="Name for the flag to enable offline pages for async download.">
-        Enables showing "DOWNLOAD PAGE LATER" button in error pages. 
+        Enables showing "DOWNLOAD PAGE LATER" button in error pages.
       </message>
       <message name="IDS_FLAGS_OFFLINE_PAGES_ASYNC_DOWNLOAD_DESCRIPTION" desc="Description for the flag to enable offline pages.">
         Enables showing "DOWNLOAD PAGE LATER" button in error pages such that the user can click on it to download the page later.
@@ -15572,6 +15572,14 @@ read aloud to screenreader users to announce that a completion is available.">
       Use the new audio rendering mixing strategy.
     </message>
 
+    <!-- Background video track disabling experiment strings. -->
+    <message name="IDS_BACKGROUND_VIDEO_TRACK_OPTIMIZATION_NAME" desc="Name of the flag for enabling optimizing background video playback.">
+      Optimize background video playback.
+    </message>
+    <message name="IDS_BACKGROUND_VIDEO_TRACK_OPTIMIZATION_DESCRIPTION" desc="Description of the flag for enabling optimizing background video playback.">
+      Disable video tracks when the video is played in the background to optimize performance.
+    </message>
+
     <if expr="is_win">
       <message name="IDS_UTILITY_PROCESS_SHELL_HANDLER_NAME" desc="The name of the utility process used to handle shell operations.">
         Shell Handler