SkPDF/Device/ImageFilter: Fix ImageFilter fallback code

src/pdf/SkPDFDevice.cpp

Index: src/pdf/SkPDFDevice.cpp
diff --git a/src/pdf/SkPDFDevice.cpp b/src/pdf/SkPDFDevice.cpp
index 5167474f106295cc15808104801308d7d256e1eb..1b16397512a834ff89d65f97fe0644e9888c6ef8 100644
--- a/src/pdf/SkPDFDevice.cpp
+++ b/src/pdf/SkPDFDevice.cpp
@@ -577,7 +577,8 @@ static bool not_supported_for_layers(const SkPaint& layerPaint) {
 }
 
 SkBaseDevice* SkPDFDevice::onCreateDevice(const CreateInfo& cinfo, const SkPaint* layerPaint) {
-    if (layerPaint && not_supported_for_layers(*layerPaint)) {
+    if (cinfo.fForImageFilter ||
+        (layerPaint && not_supported_for_layers(*layerPaint))) {
         return SkBitmapDevice::Create(cinfo.fInfo);
     }
     SkISize size = SkISize::Make(cinfo.fInfo.width(), cinfo.fInfo.height());