Export some unix-specific content symbols

content/browser/renderer_host/backing_store_gtk.h

 // Copyright (c) 2010 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 CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_GTK_H_
 #define CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_GTK_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 #include "content/browser/renderer_host/backing_store.h"
+#include "content/common/content_export.h"
 #include "ui/base/x/x11_util.h"
 
 namespace gfx {
 class Point;
 class Rect;
 }  // namespace gfx
 
 typedef struct _GdkDrawable GdkDrawable;
 class SkBitmap;
 
-class BackingStoreGtk : public BackingStore {
+class CONTENT_EXPORT BackingStoreGtk : public BackingStore {
  public:
   // Create a backing store on the X server. The visual is an Xlib Visual
   // describing the format of the target window and the depth is the color
   // depth of the X window which will be drawn into.
   BackingStoreGtk(RenderWidgetHost* widget,
                   const gfx::Size& size,
                   void* visual,
                   int depth);
 
   // This is for unittesting only. An object constructed using this constructor
@@ skipping 59 matching lines @@
   XID pixmap_;
   // This is the RENDER picture pointing at |pixmap_|.
   XID picture_;
   // This is a default graphic context, used in XCopyArea
   void* pixmap_gc_;
 
   DISALLOW_COPY_AND_ASSIGN(BackingStoreGtk);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_GTK_H_