Autoplay: use an autoplay policy setting in Blink.

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

Index: third_party/WebKit/Source/core/testing/InternalSettings.cpp
diff --git a/third_party/WebKit/Source/core/testing/InternalSettings.cpp b/third_party/WebKit/Source/core/testing/InternalSettings.cpp
index 396815554407a5ead4bdc07a38bffd30e09a3a62..18e7c466f874d790b8e323ec47c9af0b2c864c2d 100644
--- a/third_party/WebKit/Source/core/testing/InternalSettings.cpp
+++ b/third_party/WebKit/Source/core/testing/InternalSettings.cpp
@@ -534,4 +534,23 @@ void InternalSettings::setPresentationReceiver(
   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