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

src/effects/SkPaintImageFilter.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPaintImageFilter.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 15 matching lines @@
     SkPaint paint;
     buffer.readPaint(&paint);
     return Create(paint, &common.cropRect());
 }
 
 void SkPaintImageFilter::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     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;
     }
 
     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(),
                                                           bounds.height()));
     if (nullptr == device.get()) {
         return false;
     }
@@ skipping 21 matching lines @@
     // so we can't compute it. If a full crop rect is set, we should return true here.
     return false;
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkPaintImageFilter::toString(SkString* str) const {
     str->appendf("SkPaintImageFilter: (");
     str->append(")");
 }
 #endif