cc: Handle directly composited images in impl-side painting

cc/content_layer_client.h

 // Copyright 2012 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 CC_CONTENT_LAYER_CLIENT_H_
 #define CC_CONTENT_LAYER_CLIENT_H_
 
+#include "cc/cc_export.h"
+
 class SkCanvas;
 
 namespace gfx {
 class Rect;
 class RectF;
 }
 
 namespace cc {
 
-class ContentLayerClient {
+class CC_EXPORT ContentLayerClient {
 public:
     virtual void paintContents(SkCanvas*, const gfx::Rect& clip, gfx::RectF& opaque) = 0;
 
 protected:
     virtual ~ContentLayerClient() { }
 };
 
 }
 
 #endif  // CC_CONTENT_LAYER_CLIENT_H_