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diff --git a/widget/nsWidgetInitData.h b/widget/nsWidgetInitData.h
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+++ b/widget/nsWidgetInitData.h
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+/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 nsWidgetInitData_h__
+#define nsWidgetInitData_h__
+
+/**
+ * Window types
+ *
+ * Don't alter previously encoded enum values - 3rd party apps may look at
+ * these.
+ */
+enum nsWindowType {
+  eWindowType_toplevel,   // default top level window
+  eWindowType_dialog,     // top level window but usually handled differently
+                          // by the OS
+  eWindowType_sheet,      // MacOSX sheet (special dialog class)
+  eWindowType_popup,      // used for combo boxes, etc
+  eWindowType_child,      // child windows (contained inside a window on the
+                          // desktop (has no border))
+  eWindowType_invisible,  // windows that are invisible or offscreen
+  eWindowType_plugin,     // plugin window
+  eWindowType_plugin_ipc_chrome,   // chrome side native widget for plugins
+                                   // (e10s)
+  eWindowType_plugin_ipc_content,  // content side puppet widget for plugins
+                                   // (e10s)
+};
+
+/**
+ * Popup types
+ *
+ * For eWindowType_popup
+ */
+enum nsPopupType {
+  ePopupTypePanel,
+  ePopupTypeMenu,
+  ePopupTypeTooltip,
+  ePopupTypeAny = 0xF000  // used only to pass to
+                          // nsXULPopupManager::GetTopPopup
+};
+
+/**
+ * Popup levels specify the window ordering behaviour.
+ */
+enum nsPopupLevel {
+  // the popup appears just above its parent and maintains its position
+  // relative to the parent
+  ePopupLevelParent,
+  // the popup is a floating popup used for tool palettes. A parent window
+  // must be specified, but a platform implementation need not use this.
+  // On Windows, floating is generally equivalent to parent. On Mac, floating
+  // puts the popup at toplevel, but it will hide when the application is
+  // deactivated
+  ePopupLevelFloating,
+  // the popup appears on top of other windows, including those of other
+  // applications
+  ePopupLevelTop
+};
+
+/**
+ * Border styles
+ */
+enum nsBorderStyle {
+  eBorderStyle_none = 0,           // no border, titlebar, etc.. opposite of
+                                   // all
+  eBorderStyle_all = 1 << 0,       // all window decorations
+  eBorderStyle_border = 1 << 1,    // enables the border on the window. these
+                                   // are only for decoration and are not
+                                   // resize handles
+  eBorderStyle_resizeh = 1 << 2,   // enables the resize handles for the
+                                   // window. if this is set, border is
+                                   // implied to also be set
+  eBorderStyle_title = 1 << 3,     // enables the titlebar for the window
+  eBorderStyle_menu = 1 << 4,      // enables the window menu button on the
+                                   // title bar. this being on should force
+                                   // the title bar to display
+  eBorderStyle_minimize = 1 << 5,  // enables the minimize button so the user
+                                   // can minimize the window. turned off for
+                                   // tranient windows since they can not be
+                                   // minimized separate from their parent
+  eBorderStyle_maximize = 1 << 6,  // enables the maxmize button so the user
+                                   // can maximize the window
+  eBorderStyle_close = 1 << 7,     // show the close button
+  eBorderStyle_default = -1        // whatever the OS wants... i.e. don't do
+                                   // anything
+};
+
+/**
+ * Basic struct for widget initialization data.
+ * @see Create member function of nsIWidget
+ */
+
+struct nsWidgetInitData {
+  nsWidgetInitData()
+      : mWindowType(eWindowType_child),
+        mBorderStyle(eBorderStyle_default),
+        mPopupHint(ePopupTypePanel),
+        mPopupLevel(ePopupLevelTop),
+        mScreenId(0),
+        clipChildren(false),
+        clipSiblings(false),
+        mDropShadow(false),
+        mListenForResizes(false),
+        mRTL(false),
+        mNoAutoHide(false),
+        mIsDragPopup(false),
+        mIsAnimationSuppressed(false),
+        mSupportTranslucency(false),
+        mMouseTransparent(false),
+        mHasRemoteContent(false),
+        mAlwaysOnTop(false),
+        mPIPWindow(false),
+        mFissionWindow(false),
+        mResizable(false) {}
+
+  nsWindowType mWindowType;
+  nsBorderStyle mBorderStyle;
+  nsPopupType mPopupHint;
+  nsPopupLevel mPopupLevel;
+  // B2G multi-screen support. Screen ID is for differentiating screens of
+  // windows, and due to the hardware limitation, it is platform-specific for
+  // now, which align with the value of display type defined in HWC.
+  uint32_t mScreenId;
+  // when painting exclude area occupied by child windows and sibling windows
+  bool clipChildren, clipSiblings, mDropShadow;
+  bool mListenForResizes;
+  bool mRTL;
+  bool mNoAutoHide;   // true for noautohide panels
+  bool mIsDragPopup;  // true for drag feedback panels
+  // true if window creation animation is suppressed, e.g. for session restore
+  bool mIsAnimationSuppressed;
+  // true if the window should support an alpha channel, if available.
+  bool mSupportTranslucency;
+  // true if the window should be transparent to mouse events. Currently this is
+  // only valid for eWindowType_popup widgets
+  bool mMouseTransparent;
+  bool mHasRemoteContent;
+  bool mAlwaysOnTop;
+  // Is PictureInPicture window
+  bool mPIPWindow;
+  // True if fission is enabled for this window
+  bool mFissionWindow;
+  // True if the window is user-resizable.
+  bool mResizable;
+};
+
+#endif  // nsWidgetInitData_h__