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diff --git a/layout/base/PresState.ipdlh b/layout/base/PresState.ipdlh
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+/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
+/* vim: set sw=2 ts=8 et tw=80 ft=cpp : */
+/* 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/. */
+
+include "mozilla/GfxMessageUtils.h";
+include "mozilla/dom/IPCBlobUtils.h";
+
+using struct mozilla::void_t from "mozilla/ipc/IPCCore.h";
+using struct nsPoint from "nsPoint.h";
+[RefCounted] using class mozilla::dom::BlobImpl from "mozilla/dom/BlobImpl.h";
+
+namespace mozilla {
+
+struct SelectContentData {
+ uint32_t[] indices;
+ nsString[] values;
+};
+
+struct CheckedContentData {
+ bool checked;
+};
+
+union FileContentData {
+ nullable BlobImpl;
+ nsString;
+};
+
+struct TextContentData {
+ nsString value;
+ bool lastValueChangeWasInteractive;
+};
+
+union PresContentData {
+ void_t;
+ TextContentData;
+ SelectContentData;
+ CheckedContentData;
+ // We can need to serialize blobs in order to transmit this type, so we need
+ // to handle that in a custom handler.
+ FileContentData[];
+};
+
+struct PresState {
+ PresContentData contentData;
+ // For frames where layout and visual viewport aren't one and the same thing,
+ // scrollState will store the position of the *visual* viewport.
+ nsPoint scrollState;
+ bool allowScrollOriginDowngrade;
+ float resolution;
+ bool disabledSet;
+ bool disabled;
+ bool droppedDown;
+};
+
+} // namespace mozilla