get webframe_impl.cc to compile on linux

base/gfx/bitmap_platform_device_linux.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_GFX_BITMAP_PLATFORM_DEVICE_LINUX_H_
 #define BASE_GFX_BITMAP_PLATFORM_DEVICE_LINUX_H_
 
 #include "base/gfx/platform_device_linux.h"
 #include "base/ref_counted.h"
 
 namespace gfx {
 
 // I'm trying to get away with defining as little as possible on this. Right
 // now, we don't do anything.
 class BitmapPlatformDeviceLinux : public PlatformDeviceLinux {
  public:
   /// Static constructor. I don't understand this, it's just a copy of the mac
   static BitmapPlatformDeviceLinux* Create(int width, int height,
                                            bool is_opaque);
 
   /// Create a BitmapPlatformDeviceLinux from an already constructed bitmap;
   /// you should probably be using Create(). This may become private later if
   /// we ever have to share state between some native drawing UI and Skia, like
   /// the Windows and Mac versions of this class do.
   BitmapPlatformDeviceLinux(const SkBitmap& other);
   virtual ~BitmapPlatformDeviceLinux();
+
+  // A stub copy constructor.  Needs to be properly implemented.
+  BitmapPlatformDeviceLinux(const BitmapPlatformDeviceLinux& other);
 };
 
 }  // namespace gfx
 
 #endif  // BASE_GFX_BITMAP_PLATFORM_DEVICE_LINUX_H_