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

content/browser/renderer_host/render_view_host_impl.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 "content/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 448 matching lines @@
 
   std::string autoplay_policy = media::GetEffectiveAutoplayPolicy(command_line);
   if (autoplay_policy == switches::autoplay::kNoUserGestureRequiredPolicy) {
     prefs.autoplay_policy = AutoplayPolicy::kNoUserGestureRequired;
   } else if (autoplay_policy ==
              switches::autoplay::kUserGestureRequiredPolicy) {
     prefs.autoplay_policy = AutoplayPolicy::kUserGestureRequired;
   } else if (autoplay_policy ==
              switches::autoplay::kUserGestureRequiredForCrossOriginPolicy) {
     prefs.autoplay_policy = AutoplayPolicy::kUserGestureRequiredForCrossOrigin;
+  } else if (autoplay_policy ==
+             switches::autoplay::kDocumentUserActivationRequiredPolicy) {
+    prefs.autoplay_policy = AutoplayPolicy::kDocumentUserActivationRequired;
+  } else {
+    NOTREACHED();
   }
 
   const std::string touch_enabled_switch =
       command_line.HasSwitch(switches::kTouchEventFeatureDetection)
           ? command_line.GetSwitchValueASCII(
                 switches::kTouchEventFeatureDetection)
           : switches::kTouchEventFeatureDetectionAuto;
   prefs.touch_event_feature_detection_enabled =
       (touch_enabled_switch == switches::kTouchEventFeatureDetectionAuto)
           ? (ui::GetTouchScreensAvailability() ==
@@ skipping 489 matching lines @@
 }
 
 void RenderViewHostImpl::ClosePageTimeout() {
   if (delegate_->ShouldIgnoreUnresponsiveRenderer())
     return;
 
   ClosePageIgnoringUnloadEvents();
 }
 
 }  // namespace content