cc: Increment the ref count when assigning the SkImageFilter

cc/layer_impl.h

Index: cc/layer_impl.h
diff --git a/cc/layer_impl.h b/cc/layer_impl.h
index 026cdbb837f215097001bb305ffc9b3ef97c412e..23c79a5d8e4083d7aa3b75e46d45b208f9f4a298 100644
--- a/cc/layer_impl.h
+++ b/cc/layer_impl.h
@@ -19,6 +19,8 @@
 #include "cc/scoped_ptr_vector.h"
 #include "cc/shared_quad_state.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkImageFilter.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
 #include <public/WebFilterOperations.h>
@@ -115,8 +117,8 @@ public:
     void setBackgroundFilters(const WebKit::WebFilterOperations&);
     const WebKit::WebFilterOperations& backgroundFilters() const { return m_backgroundFilters; }
 
-    void setFilter(SkImageFilter*);
-    SkImageFilter* filter() const { return m_filter; }
+    void setFilter(const SkRefPtr<SkImageFilter>&);
+    SkRefPtr<SkImageFilter> filter() const { return m_filter; }
 
     void setMasksToBounds(bool);
     bool masksToBounds() const { return m_masksToBounds; }
@@ -383,7 +385,7 @@ private:
 
     WebKit::WebFilterOperations m_filters;
     WebKit::WebFilterOperations m_backgroundFilters;
-    SkImageFilter* m_filter;
+    SkRefPtr<SkImageFilter> m_filter;
 
     WebKit::WebTransformationMatrix m_drawTransform;
     WebKit::WebTransformationMatrix m_screenSpaceTransform;