use special-image for imagefilters and save/restore layer

src/core/SkDevice.cpp

Index: src/core/SkDevice.cpp
diff --git a/src/core/SkDevice.cpp b/src/core/SkDevice.cpp
index 5c92703f31815c0f0e270f0f185154611a39bb9c..9e59f9a9d392e912e99f966dbfd1ea7b427b4ad6 100644
--- a/src/core/SkDevice.cpp
+++ b/src/core/SkDevice.cpp
@@ -221,6 +221,13 @@ void SkBaseDevice::drawAtlas(const SkDraw& draw, const SkImage* atlas, const SkR
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
+void SkBaseDevice::drawSpecial(const SkDraw&, SkSpecialImage*, int x, int y, const SkPaint&) {}
+sk_sp<SkSpecialImage> SkBaseDevice::makeSpecial(const SkBitmap&) { return nullptr; }
+sk_sp<SkSpecialImage> SkBaseDevice::makeSpecial(const SkImage*) { return nullptr; }
+sk_sp<SkSpecialImage> SkBaseDevice::asSpecial() { return nullptr; }
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
 bool SkBaseDevice::readPixels(const SkImageInfo& info, void* dstP, size_t rowBytes, int x, int y) {
 #ifdef SK_DEBUG
     SkASSERT(info.width() > 0 && info.height() > 0);