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

src/effects/SkPaintImageFilter.cpp

Index: src/effects/SkPaintImageFilter.cpp
diff --git a/src/effects/SkPaintImageFilter.cpp b/src/effects/SkPaintImageFilter.cpp
index c0210513ac3c65cba731de04625bbe8965d867cd..ed5d9db4d8a9f83fd971610d00611ff84591e715 100644
--- a/src/effects/SkPaintImageFilter.cpp
+++ b/src/effects/SkPaintImageFilter.cpp
@@ -33,11 +33,11 @@ void SkPaintImageFilter::flatten(SkWriteBuffer& buffer) const {
     buffer.writePaint(fPaint);
 }
 
-bool SkPaintImageFilter::onFilterImage(Proxy* proxy,
-                                            const SkBitmap& source,
-                                            const Context& ctx,
-                                            SkBitmap* result,
-                                            SkIPoint* offset) const {
+bool SkPaintImageFilter::onFilterImageDeprecated(Proxy* proxy,
+                                                 const SkBitmap& source,
+                                                 const Context& ctx,
+                                                 SkBitmap* result,
+                                                 SkIPoint* offset) const {
     SkIRect bounds;
     if (!this->applyCropRect(ctx, source.bounds(), &bounds)) {
         return false;