[Android] Added a runtime flag to enable autoplay of muted videos.

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 f427cb9aa7ec6a59215e0c8f737beb7babc1fb14..ba50be91b076ff30db1a67c5c9433bec7c49e08e 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -5649,6 +5649,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
           <message name="IDS_FLAGS_IMPORTANT_SITES_IN_CBD_DESCRIPTION" desc="Description for the flag for using important sites whitelisting in the clear browsing dialog.">
               Include the option to whitelist important sites in the clear browsing data dialog.
           </message>
+          <message name="IDS_FLAGS_ENABLE_AUTOPLAY_MUTED_VIDEOS_NAME" desc="Title for the flag to enable autoplay of muted videos.">
+              Autoplay muted videos
+          </message>
+          <message name="IDS_FLAGS_ENABLE_AUTOPLAY_MUTED_VIDEOS_DESCRIPTION" desc="Description for the flag to enable autoplay of muted videos.">
+              Allow muted videos to autoplay.
+          </message>
       </if>
       <if expr="use_ash">
         <message name="IDS_FLAGS_ASH_MD" desc="Title of the flag which enables or disables material design in Chrome OS system UI.">