cc: Increment the ref count when assigning the SkImageFilter

cc/damage_tracker.h

 // Copyright 2011 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_DAMAGE_TRACKER_H_
 #define CC_DAMAGE_TRACKER_H_
 
 #include "base/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/cc_export.h"
+#include "third_party/skia/include/core/SkImageFilter.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
 #include "ui/gfx/rect_f.h"
 #include <vector>
 
-class SkImageFilter;
-
 namespace gfx {
 class Rect;
 }
 
 namespace WebKit {
 class WebFilterOperations;
 }
 
 namespace cc {
 
 class LayerImpl;
 class RenderSurfaceImpl;
 
 // Computes the region where pixels have actually changed on a RenderSurfaceImpl. This region is used
 // to scissor what is actually drawn to the screen to save GPU computation and bandwidth.
 class CC_EXPORT DamageTracker {
 public:
     static scoped_ptr<DamageTracker> create();
     ~DamageTracker();
 
     void didDrawDamagedArea() { m_currentDamageRect = gfx::RectF(); }
     void forceFullDamageNextUpdate() { m_forceFullDamageNextUpdate = true; }
-    void updateDamageTrackingState(const std::vector<LayerImpl*>& layerList, int targetSurfaceLayerID, bool targetSurfacePropertyChangedOnlyFromDescendant, const gfx::Rect& targetSurfaceContentRect, LayerImpl* targetSurfaceMaskLayer, const WebKit::WebFilterOperations&, SkImageFilter* filter);
+    void updateDamageTrackingState(const std::vector<LayerImpl*>& layerList, int targetSurfaceLayerID, bool targetSurfacePropertyChangedOnlyFromDescendant, const gfx::Rect& targetSurfaceContentRect, LayerImpl* targetSurfaceMaskLayer, const WebKit::WebFilterOperations&, const SkRefPtr<SkImageFilter>& filter);
 
     const gfx::RectF& currentDamageRect() { return m_currentDamageRect; }
 
 private:
     DamageTracker();
 
     gfx::RectF trackDamageFromActiveLayers(const std::vector<LayerImpl*>& layerList, int targetSurfaceLayerID);
     gfx::RectF trackDamageFromSurfaceMask(LayerImpl* targetSurfaceMaskLayer);
     gfx::RectF trackDamageFromLeftoverRects();
 
@@ skipping 13 matching lines @@
 
     gfx::RectF m_currentDamageRect;
     bool m_forceFullDamageNextUpdate;
 
     DISALLOW_COPY_AND_ASSIGN(DamageTracker);
 };
 
 } // namespace cc
 
 #endif  // CC_DAMAGE_TRACKER_H_