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diff --git a/dom/base/PostMessageEvent.h b/dom/base/PostMessageEvent.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_PostMessageEvent_h
+#define mozilla_dom_PostMessageEvent_h
+
+#include "js/StructuredClone.h"
+#include "js/TypeDecls.h"
+#include "mozilla/dom/DOMTypes.h"
+#include "mozilla/dom/ipc/StructuredCloneData.h"
+#include "mozilla/dom/StructuredCloneHolder.h"
+#include "nsCOMPtr.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/MaybeOneOf.h"
+#include "mozilla/RefPtr.h"
+#include "nsThreadUtils.h"
+
+class nsGlobalWindowOuter;
+class nsGlobalWindowInner;
+class nsIPrincipal;
+class nsIURI;
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+
+class BrowsingContext;
+class Event;
+class EventTarget;
+
+/**
+ * Class used to represent events generated by calls to Window.postMessage,
+ * which asynchronously creates and dispatches events.
+ */
+class PostMessageEvent final : public Runnable {
+ public:
+ NS_DECL_NSIRUNNABLE
+
+ // aCallerWindowID should not be 0.
+ PostMessageEvent(BrowsingContext* aSource, const nsAString& aCallerOrigin,
+ nsGlobalWindowOuter* aTargetWindow,
+ nsIPrincipal* aProvidedPrincipal, uint64_t aCallerWindowID,
+ nsIURI* aCallerURI, const nsCString& aScriptLocation,
+ const Maybe<nsID>& aCallerAgentClusterId)
+ : PostMessageEvent(aSource, aCallerOrigin, aTargetWindow,
+ aProvidedPrincipal, aCallerWindowID, aCallerURI,
+ aScriptLocation, false, aCallerAgentClusterId) {}
+
+ // To be used when the caller's window lives in a different process.
+ PostMessageEvent(BrowsingContext* aSource, const nsAString& aCallerOrigin,
+ nsGlobalWindowOuter* aTargetWindow,
+ nsIPrincipal* aProvidedPrincipal, uint64_t aCallerWindowID,
+ nsIURI* aCallerURI, const nsCString& aScriptLocation,
+ bool aIsFromPrivateWindow)
+ : PostMessageEvent(aSource, aCallerOrigin, aTargetWindow,
+ aProvidedPrincipal, aCallerWindowID, aCallerURI,
+ aScriptLocation, aIsFromPrivateWindow, Nothing()) {}
+
+ void Write(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+ JS::Handle<JS::Value> aTransfer,
+ const JS::CloneDataPolicy& aClonePolicy, ErrorResult& aError) {
+ mHolder.construct<StructuredCloneHolder>(
+ StructuredCloneHolder::CloningSupported,
+ StructuredCloneHolder::TransferringSupported,
+ JS::StructuredCloneScope::SameProcess);
+ mHolder.ref<StructuredCloneHolder>().Write(aCx, aMessage, aTransfer,
+ aClonePolicy, aError);
+ }
+ void UnpackFrom(const ClonedOrErrorMessageData& aMessageData) {
+ if (aMessageData.type() != ClonedOrErrorMessageData::TClonedMessageData) {
+ return;
+ }
+
+ mHolder.construct<ipc::StructuredCloneData>();
+ // FIXME Want to steal!
+ // See https://bugzilla.mozilla.org/show_bug.cgi?id=1516349.
+ mHolder.ref<ipc::StructuredCloneData>().CopyFromClonedMessageDataForChild(
+ aMessageData);
+ }
+
+ void DispatchToTargetThread(ErrorResult& aError);
+
+ private:
+ PostMessageEvent(BrowsingContext* aSource, const nsAString& aCallerOrigin,
+ nsGlobalWindowOuter* aTargetWindow,
+ nsIPrincipal* aProvidedPrincipal, uint64_t aCallerWindowID,
+ nsIURI* aCallerURI, const nsCString& aScriptLocation,
+ bool aIsFromPrivateWindow,
+ const Maybe<nsID>& aCallerAgentClusterId);
+ ~PostMessageEvent();
+
+ void Dispatch(nsGlobalWindowInner* aTargetWindow, Event* aEvent);
+
+ void DispatchError(JSContext* aCx, nsGlobalWindowInner* aTargetWindow,
+ mozilla::dom::EventTarget* aEventTarget);
+
+ RefPtr<BrowsingContext> mSource;
+ nsString mCallerOrigin;
+ RefPtr<nsGlobalWindowOuter> mTargetWindow;
+ nsCOMPtr<nsIPrincipal> mProvidedPrincipal;
+ // If the postMessage call was made on a WindowProxy whose Window lives in a
+ // separate process then mHolder will contain a StructuredCloneData, else
+ // it'll contain a StructuredCloneHolder.
+ MaybeOneOf<StructuredCloneHolder, ipc::StructuredCloneData> mHolder;
+ uint64_t mCallerWindowID;
+ const Maybe<nsID> mCallerAgentClusterId;
+ nsCOMPtr<nsIURI> mCallerURI;
+ // if callerURI is null, then we can use script location for reporting errors
+ // to console
+ const Maybe<nsCString> mScriptLocation;
+ // This is only set to a relevant value if mCallerWindowID doesn't contain a
+ // value.
+ bool mIsFromPrivateWindow;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_PostMessageEvent_h