Autoplay: add document user activation flag in chrome://flags

media/base/media_switches.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/media_switches.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "ppapi/features/features.h"
 
 namespace switches {
@@ skipping 146 matching lines @@
     "ignore-autoplay-restrictions";
 
 #if !defined(OS_ANDROID)
 // Turns on the internal media session backend. This should be used by embedders
 // that want to control the media playback with the media session interfaces.
 const char kEnableInternalMediaSession[] = "enable-internal-media-session";
 #endif  // !defined(OS_ANDROID)
 
 namespace autoplay {
 
+// Autoplay policy that requires a document user activation.
+const char kDocumentUserActivationRequiredPolicy[] =
+    "document-user-activation-required";
+
 // Autoplay policy that does not require any user gesture.
 const char kNoUserGestureRequiredPolicy[] = "no-user-gesture-required";
 
 // Autoplay policy to require a user gesture in order to play.
 const char kUserGestureRequiredPolicy[] = "user-gesture-required";
 
 // Autoplay policy to require a user gesture in ordor to play for cross origin
 // iframes.
 const char kUserGestureRequiredForCrossOriginPolicy[] =
     "user-gesture-required-for-cross-origin";
@@ skipping 126 matching lines @@
 
 // The default value is platform dependent.
 #if defined(OS_ANDROID)
   return switches::autoplay::kUserGestureRequiredPolicy;
 #else
   return switches::autoplay::kNoUserGestureRequiredPolicy;
 #endif
 }
 
 }  // namespace media