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

src/gpu/SkGpuDevice.cpp

Index: src/gpu/SkGpuDevice.cpp
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index cb92ab3edfd202a56b4a1424d0d495bd971be483..df5c7a73a11a18b68df092008608db8e6b5b91f0 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -1129,7 +1129,7 @@ bool SkGpuDevice::filterTexture(GrContext* context, GrTexture* texture,
     if (filter->canFilterImageGPU()) {
         SkBitmap bm;
         GrWrapTextureInBitmap(texture, width, height, false, &bm);
-        return filter->filterImageGPU(&proxy, bm, ctx, result, offset);
+        return filter->filterImageGPUDeprecated(&proxy, bm, ctx, result, offset);
     } else {
         return false;
     }