Add output format properties to SkImageFilter::Context

src/effects/SkComposeImageFilter.cpp

Index: src/effects/SkComposeImageFilter.cpp
diff --git a/src/effects/SkComposeImageFilter.cpp b/src/effects/SkComposeImageFilter.cpp
index a54e53b67a727546e753f4a2c68b0da2926a68aa..a5b9190a4cb902dde71a1cd3c2088debcf65f6c3 100644
--- a/src/effects/SkComposeImageFilter.cpp
+++ b/src/effects/SkComposeImageFilter.cpp
@@ -38,7 +38,7 @@ sk_sp<SkSpecialImage> SkComposeImageFilter::onFilterImage(SkSpecialImage* source
     // filter requires as input. This matters if the outer filter moves pixels.
     SkIRect innerClipBounds;
     innerClipBounds = this->getInput(0)->filterBounds(ctx.clipBounds(), ctx.ctm());
-    Context innerContext(ctx.ctm(), innerClipBounds, ctx.cache());
+    Context innerContext(ctx.ctm(), innerClipBounds, ctx.cache(), ctx.outputProperties());
     SkIPoint innerOffset = SkIPoint::Make(0, 0);
     sk_sp<SkSpecialImage> inner(this->filterInput(1, source, innerContext, &innerOffset));
     if (!inner) {
@@ -49,7 +49,7 @@ sk_sp<SkSpecialImage> SkComposeImageFilter::onFilterImage(SkSpecialImage* source
     outerMatrix.postTranslate(SkIntToScalar(-innerOffset.x()), SkIntToScalar(-innerOffset.y()));
     SkIRect clipBounds = ctx.clipBounds();
     clipBounds.offset(-innerOffset.x(), -innerOffset.y());
-    Context outerContext(outerMatrix, clipBounds, ctx.cache());
+    Context outerContext(outerMatrix, clipBounds, ctx.cache(), ctx.outputProperties());
 
     SkIPoint outerOffset = SkIPoint::Make(0, 0);
     sk_sp<SkSpecialImage> outer(this->filterInput(0, inner.get(), outerContext, &outerOffset));