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

gm/imagefiltersgraph.cpp

Index: gm/imagefiltersgraph.cpp
diff --git a/gm/imagefiltersgraph.cpp b/gm/imagefiltersgraph.cpp
index e7837891243cce6a89c782e699495f3f277dd7ab..26ebc4df7dd7982cb2b8633023763c6d41d0c1a7 100644
--- a/gm/imagefiltersgraph.cpp
+++ b/gm/imagefiltersgraph.cpp
@@ -39,16 +39,16 @@ public:
         return new SimpleOffsetFilter(dx, dy, input);
     }
 
-    virtual bool onFilterImage(Proxy* proxy, const SkBitmap& src, const Context& ctx,
-                               SkBitmap* dst, SkIPoint* offset) const override {
+    bool onFilterImageDeprecated(Proxy* proxy, const SkBitmap& src, const Context& ctx,
+                                 SkBitmap* dst, SkIPoint* offset) const override {
         SkBitmap source = src;
         SkIPoint srcOffset = SkIPoint::Make(0, 0);
-        if (!this->filterInput(0, proxy, src, ctx, &source, &srcOffset)) {
+        if (!this->filterInputDeprecated(0, proxy, src, ctx, &source, &srcOffset)) {
             return false;
         }
 
         SkIRect bounds;
-        if (!this->applyCropRect(ctx, proxy, source, &srcOffset, &bounds, &source)) {
+        if (!this->applyCropRectDeprecated(ctx, proxy, source, &srcOffset, &bounds, &source)) {
             return false;
         }