Add subsetting to SkScaledCodec

src/codec/SkBmpMaskCodec.cpp

Index: src/codec/SkBmpMaskCodec.cpp
diff --git a/src/codec/SkBmpMaskCodec.cpp b/src/codec/SkBmpMaskCodec.cpp
index 336698d319d2e8f96c10a2b60da755040535f150..0f6df0b5715fb462033212993544cc771bb1644d 100644
--- a/src/codec/SkBmpMaskCodec.cpp
+++ b/src/codec/SkBmpMaskCodec.cpp
@@ -60,8 +60,8 @@ SkCodec::Result SkBmpMaskCodec::onGetPixels(const SkImageInfo& dstInfo,
 
 bool SkBmpMaskCodec::initializeSwizzler(const SkImageInfo& dstInfo) {
     // Create the swizzler
-    fMaskSwizzler.reset(SkMaskSwizzler::CreateMaskSwizzler(
-            dstInfo, this->getInfo(), fMasks, this->bitsPerPixel()));
+    fMaskSwizzler.reset(SkMaskSwizzler::CreateMaskSwizzler(dstInfo, this->getInfo(), fMasks,
+            this->bitsPerPixel(), this->subsetLeft(), this->subsetWidth()));
 
     if (nullptr == fMaskSwizzler.get()) {
         return false;