Autoplay: use an autoplay policy setting in Blink.

third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp

Index: third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp b/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp
index 3b44d912f65d76ccc49834a0758957e040a2c7dc..b88a723d5eceea1ae15d3f8bde2a38f8e37109bd 100644
--- a/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp
@@ -38,6 +38,7 @@
 #include "core/dom/TaskRunnerHelper.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLMediaElement.h"
+#include "core/html/media/AutoplayPolicy.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/inspector/ConsoleTypes.h"
 #include "modules/mediastream/MediaStream.h"
@@ -105,10 +106,11 @@ BaseAudioContext::BaseAudioContext(Document* document)
       periodic_wave_sawtooth_(nullptr),
       periodic_wave_triangle_(nullptr),
       output_position_() {
-  // If mediaPlaybackRequiresUserGesture is enabled, cross origin iframes will
-  // require user gesture for the AudioContext to produce sound.
-  if (document->GetSettings() &&
-      document->GetSettings()->GetMediaPlaybackRequiresUserGesture() &&
+  // If the autoplay policy requires a user gesture, cross origin iframes will
+  // require user gesture for the AudioContext to produce sound. This apply even
+  // if the autoplay policy requires user gesture for top frames.
+  if (AutoplayPolicy::GetAutoplayPolicyForDocument(*document) !=
+          AutoplayPolicy::Type::kNoUserGestureRequired &&
       document->GetFrame() && document->GetFrame()->IsCrossOriginSubframe()) {
     autoplay_status_ = AutoplayStatus::kAutoplayStatusFailed;
     user_gesture_required_ = true;