Autoplay: use an autoplay policy setting in Blink.

third_party/WebKit/Source/core/testing/InternalSettings.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 516 matching lines @@
   RuntimeEnabledFeatures::setCompositorWorkerEnabled(enabled);
 }
 
 void InternalSettings::setPresentationReceiver(
     bool enabled,
     ExceptionState& exception_state) {
   InternalSettingsGuardForSettings();
   GetSettings()->SetPresentationReceiver(enabled);
 }
 
+void InternalSettings::setAutoplayPolicy(const String& policy_str,
+                                         ExceptionState& exception_state) {
+  InternalSettingsGuardForSettings();
+
+  AutoplayPolicy::Type policy = AutoplayPolicy::Type::kNoUserGestureRequired;
+  if (policy_str == "no-user-gesture-required") {
+    policy = AutoplayPolicy::Type::kNoUserGestureRequired;
+  } else if (policy_str == "user-gesture-required") {
+    policy = AutoplayPolicy::Type::kUserGestureRequired;
+  } else if (policy_str == "user-gesture-required-for-cross-origin") {
+    policy = AutoplayPolicy::Type::kUserGestureRequiredForCrossOrigin;
+  } else {
+    exception_state.ThrowDOMException(
+        kSyntaxError, "The autoplay policy ('" + policy_str + ")' is invalid.");
+  }
+
+  GetSettings()->SetAutoplayPolicy(policy);
+}
+
 }  // namespace blink