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diff --git a/dom/plugins/ipc/PluginInterposeOSX.h b/dom/plugins/ipc/PluginInterposeOSX.h
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+++ b/dom/plugins/ipc/PluginInterposeOSX.h
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+// vim:set ts=2 sts=2 sw=2 et cin:
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef DOM_PLUGINS_IPC_PLUGININTERPOSEOSX_H
+#define DOM_PLUGINS_IPC_PLUGININTERPOSEOSX_H
+
+#include "base/basictypes.h"
+#include "nsPoint.h"
+#include "npapi.h"
+
+// Make this includable from non-Objective-C code.
+#ifndef __OBJC__
+class NSCursor;
+#else
+#import <Cocoa/Cocoa.h>
+#endif
+
+// The header file QuickdrawAPI.h is missing on OS X 10.7 and up (though the
+// QuickDraw APIs defined in it are still present) -- so we need to supply the
+// relevant parts of its contents here.  It's likely that Apple will eventually
+// remove the APIs themselves (probably in OS X 10.8), so we need to make them
+// weak imports, and test for their presence before using them.
+#if !defined(__QUICKDRAWAPI__)
+
+typedef short Bits16[16];
+struct Cursor {
+  Bits16  data;
+  Bits16  mask;
+  Point   hotSpot;
+};
+typedef struct Cursor Cursor;
+
+#endif /* __QUICKDRAWAPI__ */
+
+namespace mac_plugin_interposing {
+
+// Class used to serialize NSCursor objects over IPC between processes.
+class NSCursorInfo {
+public:
+  enum Type {
+    TypeCustom,
+    TypeArrow,
+    TypeClosedHand,
+    TypeContextualMenu,   // Only supported on OS X 10.6 and up
+    TypeCrosshair,
+    TypeDisappearingItem,
+    TypeDragCopy,         // Only supported on OS X 10.6 and up
+    TypeDragLink,         // Only supported on OS X 10.6 and up
+    TypeIBeam,
+    TypeNotAllowed,       // Only supported on OS X 10.6 and up
+    TypeOpenHand,
+    TypePointingHand,
+    TypeResizeDown,
+    TypeResizeLeft,
+    TypeResizeLeftRight,
+    TypeResizeRight,
+    TypeResizeUp,
+    TypeResizeUpDown,
+    TypeTransparent       // Special type
+  };
+
+  NSCursorInfo();
+  explicit NSCursorInfo(NSCursor* aCursor);
+  explicit NSCursorInfo(const Cursor* aCursor);
+  ~NSCursorInfo();
+
+  NSCursor* GetNSCursor() const;
+  Type GetType() const;
+  const char* GetTypeName() const;
+  nsPoint GetHotSpot() const;
+  uint8_t* GetCustomImageData() const;
+  uint32_t GetCustomImageDataLength() const;
+
+  void SetType(Type aType);
+  void SetHotSpot(nsPoint aHotSpot);
+  void SetCustomImageData(uint8_t* aData, uint32_t aDataLength);
+
+  static bool GetNativeCursorsSupported();
+
+private:
+  NSCursor* GetTransparentCursor() const;
+
+  Type mType;
+  // The hot spot's coordinate system is the cursor's coordinate system, and
+  // has an upper-left origin (in both Cocoa and pre-Cocoa systems).
+  nsPoint mHotSpot;
+  uint8_t* mCustomImageData;
+  uint32_t mCustomImageDataLength;
+  static int32_t mNativeCursorsSupported;
+};
+
+namespace parent {
+
+void OnPluginShowWindow(uint32_t window_id, CGRect window_bounds, bool modal);
+void OnPluginHideWindow(uint32_t window_id, pid_t aPluginPid);
+void OnSetCursor(const NSCursorInfo& cursorInfo);
+void OnShowCursor(bool show);
+void OnPushCursor(const NSCursorInfo& cursorInfo);
+void OnPopCursor();
+
+} // namespace parent
+
+namespace child {
+
+void SetUpCocoaInterposing();
+
+} // namespace child
+
+} // namespace mac_plugin_interposing
+
+#endif /* DOM_PLUGINS_IPC_PLUGININTERPOSEOSX_H */