[Blink>Media] Add Chrome feature for disabling autoplay unmuted in WebAPK

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index c4f6a7919fff6486c83be77353d61cc06628573a..bab9c38636f2a9e2dc2cfd2b1aad7a08f82a3777 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -2583,13 +2583,16 @@ void ChromeContentBrowserClient::OverrideWebkitPrefs(
   web_prefs->data_saver_enabled = GetDataSaverEnabledPref(prefs);
 
 #if defined(OS_ANDROID)
-  content::WebContents* contents =
-      content::WebContents::FromRenderViewHost(rvh);
-  if (contents) {
-    TabAndroid* tab_android = TabAndroid::FromWebContents(contents);
-    if (tab_android) {
-      web_prefs->media_playback_gesture_whitelist_scope =
-          tab_android->GetWebappManifestScope();
+  if (base::FeatureList::IsEnabled(
+          features::kAllowAutoplayUnmutedInWebappManifestScope)) {
+    content::WebContents* contents =
+        content::WebContents::FromRenderViewHost(rvh);
+    if (contents) {
+      TabAndroid* tab_android = TabAndroid::FromWebContents(contents);
+      if (tab_android) {
+        web_prefs->media_playback_gesture_whitelist_scope =
+            tab_android->GetWebappManifestScope();
+      }
     }
   }
 #endif  // defined(OS_ANDROID)