Creating framework for drawShadowedPicture

src/core/SkPictureRecord.cpp

Index: src/core/SkPictureRecord.cpp
diff --git a/src/core/SkPictureRecord.cpp b/src/core/SkPictureRecord.cpp
index f2a0fd857c3a4338626ebea35737c61cef2fc849..8b6faf8cb6566b76a0b4fd1f2df201928027e9b7 100644
--- a/src/core/SkPictureRecord.cpp
+++ b/src/core/SkPictureRecord.cpp
@@ -672,6 +672,27 @@ void SkPictureRecord::onDrawPicture(const SkPicture* picture, const SkMatrix* ma
     this->validate(initialOffset, size);
 }
 
+void SkPictureRecord::onDrawShadowedPicture(const SkPicture* picture,
+                                            const SkMatrix* matrix,
+                                            const SkPaint* paint) {
+    // op + picture index
+    size_t size = 2 * kUInt32Size;
+    size_t initialOffset;
+
+    if (nullptr == matrix && nullptr == paint) {
+        initialOffset = this->addDraw(DRAW_PICTURE, &size);
+        this->addPicture(picture);
+    } else {
+        const SkMatrix& m = matrix ? *matrix : SkMatrix::I();
+        size += m.writeToMemory(nullptr) + kUInt32Size;    // matrix + paint
+        initialOffset = this->addDraw(DRAW_PICTURE_MATRIX_PAINT, &size);
+        this->addPaintPtr(paint);
+        this->addMatrix(m);
+        this->addPicture(picture);
+    }
+    this->validate(initialOffset, size);
+}
+
 void SkPictureRecord::onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) {
     // op + drawable index
     size_t size = 2 * kUInt32Size;