Mark existing image filter entry points that will be going away with Deprecated

include/effects/SkComposeImageFilter.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkComposeImageFilter_DEFINED
 #define SkComposeImageFilter_DEFINED
 
@@ skipping 16 matching lines @@
     void computeFastBounds(const SkRect& src, SkRect* dst) const override;
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeImageFilter)
 
 protected:
     explicit SkComposeImageFilter(SkImageFilter* inputs[2]) : INHERITED(2, inputs) {
         SkASSERT(inputs[0]);
         SkASSERT(inputs[1]);
     }
-    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
-                               SkBitmap* result, SkIPoint* loc) const override;
+    bool onFilterImageDeprecated(Proxy*, const SkBitmap& src, const Context&,
+                                 SkBitmap* result, SkIPoint* loc) const override;
     bool onFilterBounds(const SkIRect&, const SkMatrix&, SkIRect*, MapDirection) const override;
 
 private:
     typedef SkImageFilter INHERITED;
 };
 
 #endif