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diff --git a/layout/base/nsFrameManagerBase.h b/layout/base/nsFrameManagerBase.h
new file mode 100644
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim:cindent:ts=2:et:sw=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/.
+ *
+ * This Original Code has been modified by IBM Corporation. Modifications made
+ * by IBM described herein are Copyright (c) International Business Machines
+ * Corporation, 2000. Modifications to Mozilla code or documentation identified
+ * per MPL Section 3.3
+ *
+ * Date             Modified by     Description of modification
+ * 04/20/2000       IBM Corp.      OS/2 VisualAge build.
+ */
+
+/* part of nsFrameManager, to work around header inclusionordering */
+
+#ifndef _nsFrameManagerBase_h_
+#define _nsFrameManagerBase_h_
+
+#include "nsDebug.h"
+#include "PLDHashTable.h"
+#include "mozilla/Attributes.h"
+
+class nsIFrame;
+class nsIPresShell;
+
+class nsFrameManagerBase
+{
+public:
+  nsFrameManagerBase();
+
+  bool IsDestroyingFrames() { return mIsDestroyingFrames; }
+
+  /*
+   * Gets and sets the root frame (typically the viewport). The lifetime of the
+   * root frame is controlled by the frame manager. When the frame manager is
+   * destroyed, it destroys the entire frame hierarchy.
+   */
+  nsIFrame* GetRootFrame() const { return mRootFrame; }
+  void      SetRootFrame(nsIFrame* aRootFrame)
+  {
+    NS_ASSERTION(!mRootFrame, "already have a root frame");
+    mRootFrame = aRootFrame;
+  }
+
+  static uint32_t GetGlobalGenerationNumber() { return sGlobalGenerationNumber; }
+
+protected:
+  class UndisplayedMap;
+
+  // weak link, because the pres shell owns us
+  nsIPresShell* MOZ_NON_OWNING_REF mPresShell;
+  nsIFrame*                       mRootFrame;
+  PLDHashTable                    mPlaceholderMap;
+  UndisplayedMap*                 mUndisplayedMap;
+  UndisplayedMap*                 mDisplayContentsMap;
+  bool                            mIsDestroyingFrames;  // The frame manager is destroying some frame(s).
+
+  // The frame tree generation number
+  // We use this to avoid unnecessary screenshotting
+  // on Android. Unfortunately, this is static to match
+  // the single consumer which is also static. Keeping
+  // this the same greatly simplifies lifetime issues and
+  // makes sure we always using the correct number.
+  // A per PresContext generation number is available
+  // via nsPresContext::GetDOMGeneration
+  static uint32_t                 sGlobalGenerationNumber;
+};
+
+#endif