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diff --git a/dom/plugins/ipc/PluginUtilsOSX.h b/dom/plugins/ipc/PluginUtilsOSX.h
new file mode 100644
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+++ b/dom/plugins/ipc/PluginUtilsOSX.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+// vim:set ts=2 sts=2 sw=2 et cin:
+/* 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 dom_plugins_PluginUtilsOSX_h
+#define dom_plugins_PluginUtilsOSX_h 1
+
+#include "npapi.h"
+#include "mozilla/gfx/QuartzSupport.h"
+#include "nsRect.h"
+
+namespace mozilla {
+namespace plugins {
+namespace PluginUtilsOSX {
+
+// Need to call back into the browser's message loop to process event.
+typedef void (*RemoteProcessEvents) (void*);
+
+NPError ShowCocoaContextMenu(void* aMenu, int aX, int aY, void* pluginModule, RemoteProcessEvents remoteEvent);
+
+void InvokeNativeEventLoop();
+
+// Need to call back and send a cocoa draw event to the plugin.
+typedef void (*DrawPluginFunc) (CGContextRef, void*, nsIntRect aUpdateRect);
+
+void* GetCGLayer(DrawPluginFunc aFunc, void* aPluginInstance, double aContentsScaleFactor);
+void ReleaseCGLayer(void* cgLayer);
+void Repaint(void* cgLayer, nsIntRect aRect);
+
+bool SetProcessName(const char* aProcessName);
+
+/*
+ * Provides a wrapper around nsCARenderer to manage double buffering
+ * without having to unbind nsCARenderer on every surface swaps.
+ *
+ * The double buffer renderer begins with no initialize surfaces.
+ * The buffers can be initialized and cleared individually.
+ * Swapping still occurs regardless if the buffers are initialized.
+ */
+class nsDoubleBufferCARenderer {
+public:
+  nsDoubleBufferCARenderer() : mCALayer(nullptr), mContentsScaleFactor(1.0) {}
+  // Returns width in "display pixels".  A "display pixel" is the smallest
+  // fully addressable part of a display.  But in HiDPI modes each "display
+  // pixel" corresponds to more than one device pixel.  Multiply display pixels
+  // by mContentsScaleFactor to get device pixels.
+  size_t GetFrontSurfaceWidth();
+  // Returns height in "display pixels".  Multiply by
+  // mContentsScaleFactor to get device pixels.
+  size_t GetFrontSurfaceHeight();
+  double GetFrontSurfaceContentsScaleFactor();
+  // Returns width in "display pixels".  Multiply by
+  // mContentsScaleFactor to get device pixels.
+  size_t GetBackSurfaceWidth();
+  // Returns height in "display pixels".  Multiply by
+  // mContentsScaleFactor to get device pixels.
+  size_t GetBackSurfaceHeight();
+  double GetBackSurfaceContentsScaleFactor();
+  IOSurfaceID GetFrontSurfaceID();
+
+  bool HasBackSurface();
+  bool HasFrontSurface();
+  bool HasCALayer();
+
+  void SetCALayer(void *aCALayer);
+  // aWidth and aHeight are in "display pixels".  Multiply by
+  // aContentsScaleFactor to get device pixels.
+  bool InitFrontSurface(size_t aWidth, size_t aHeight,
+                        double aContentsScaleFactor,
+                        AllowOfflineRendererEnum aAllowOfflineRenderer);
+  void Render();
+  void SwapSurfaces();
+  void ClearFrontSurface();
+  void ClearBackSurface();
+
+  double GetContentsScaleFactor() { return mContentsScaleFactor; }
+
+private:
+  void *mCALayer;
+  RefPtr<nsCARenderer> mCARenderer;
+  RefPtr<MacIOSurface> mFrontSurface;
+  RefPtr<MacIOSurface> mBackSurface;
+  double mContentsScaleFactor;
+};
+
+} // namespace PluginUtilsOSX
+} // namespace plugins
+} // namespace mozilla
+
+#endif //dom_plugins_PluginUtilsOSX_h