deferred canvas

dm/DMSrcSink.cpp

Index: dm/DMSrcSink.cpp
diff --git a/dm/DMSrcSink.cpp b/dm/DMSrcSink.cpp
index f0b10103f7494d17a97ccb4bbbdde447a8afaa61..258e94e7e6bff8a5179073863898c0c17aaed62d 100644
--- a/dm/DMSrcSink.cpp
+++ b/dm/DMSrcSink.cpp
@@ -15,6 +15,7 @@
 #include "SkColorSpaceXform.h"
 #include "SkCommonFlags.h"
 #include "SkData.h"
+#include "SkDeferredCanvas.h"
 #include "SkDocument.h"
 #include "SkError.h"
 #include "SkImageGenerator.h"
@@ -1439,6 +1440,16 @@ Error ViaPicture::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkSt
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
+Error ViaDefer::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
+    auto size = src.size();
+    return draw_to_canvas(fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) -> Error {
+        SkDeferredCanvas deferred(canvas);
+        return src.draw(&deferred);
+    });
+}
+
+/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
+
 // Draw the Src into two pictures, then draw the second picture into the wrapped Sink.
 // This tests that any shortcuts we may take while recording that second picture are legal.
 Error ViaSecondPicture::draw(