add backdrop option to SaveLayerRec

src/core/SkPicturePlayback.cpp

Index: src/core/SkPicturePlayback.cpp
diff --git a/src/core/SkPicturePlayback.cpp b/src/core/SkPicturePlayback.cpp
index 82b8f0e5782ef6ac494e124952f46719448c98cd..4b028f714e91da5d2c96a108fd177c4afedab023 100644
--- a/src/core/SkPicturePlayback.cpp
+++ b/src/core/SkPicturePlayback.cpp
@@ -483,11 +483,29 @@ void SkPicturePlayback::handleOp(SkReader32* reader,
             auto flags = SkCanvas::LegacySaveFlagsToSaveLayerFlags(reader->readInt());
             canvas->saveLayer(SkCanvas::SaveLayerRec(boundsPtr, paint, flags));
         } break;
-        case SAVE_LAYER_SAVELAYERFLAGS: {
+        case SAVE_LAYER_SAVELAYERFLAGS_DEPRECATED_JAN_2016: {
             const SkRect* boundsPtr = get_rect_ptr(reader);
             const SkPaint* paint = fPictureData->getPaint(reader);
             canvas->saveLayer(SkCanvas::SaveLayerRec(boundsPtr, paint, reader->readInt()));
         } break;
+        case SAVE_LAYER_SAVELAYERREC: {
+            SkCanvas::SaveLayerRec rec(nullptr, nullptr, nullptr, 0);
+            const uint32_t flatFlags = reader->readInt();
+            if (flatFlags & SAVELAYERREC_HAS_BOUNDS) {
+                rec.fBounds = &reader->skipT<SkRect>();
+            }
+            if (flatFlags & SAVELAYERREC_HAS_PAINT) {
+                rec.fPaint = fPictureData->getPaint(reader);
+            }
+            if (flatFlags & SAVELAYERREC_HAS_BACKDROP) {
+                const SkPaint* paint = fPictureData->getPaint(reader);
+                rec.fBackdrop = paint->getImageFilter();
+            }
+            if (flatFlags & SAVELAYERREC_HAS_FLAGS) {
+                rec.fSaveLayerFlags = reader->readInt();
+            }
+            canvas->saveLayer(rec);
+        } break;
         case SCALE: {
             SkScalar sx = reader->readScalar();
             SkScalar sy = reader->readScalar();