Enable flattening of SkRecordedDrawable

src/core/SkPictureRecorder.cpp

Index: src/core/SkPictureRecorder.cpp
diff --git a/src/core/SkPictureRecorder.cpp b/src/core/SkPictureRecorder.cpp
index b6bb34d5b451d3ef87d7d169fff71d36f1ac0789..1ea912f9157218c18eb19a68b9717bce60b36139 100644
--- a/src/core/SkPictureRecorder.cpp
+++ b/src/core/SkPictureRecorder.cpp
@@ -9,6 +9,8 @@
 #include "SkData.h"
 #include "SkDrawable.h"
 #include "SkLayerInfo.h"
+#include "SkPictureData.h"
+#include "SkPictureRecord.h"
 #include "SkPictureRecorder.h"
 #include "SkPictureUtils.h"
 #include "SkRecord.h"
@@ -16,6 +18,7 @@
 #include "SkRecordOpts.h"
 #include "SkRecorder.h"
 #include "SkTypes.h"
+#include "SkWriteBuffer.h"
 
 SkPictureRecorder::SkPictureRecorder() {
     fActivelyRecording = false;
@@ -175,6 +178,39 @@ protected:
         return new SkBigPicture(fBounds, SkRef(fRecord.get()), pictList, SkSafeRef(fBBH.get()),
                                 saveLayerData.release(), subPictureBytes);
     }
+
+    void flatten(SkWriteBuffer& buffer) const {
+        // Write the bounds.
+        buffer.writeRect(fBounds);
+
+        // Create an SkPictureRecord to record the draw commands.
+        SkPictInfo info;
+        SkPictureRecord pictureRecord(SkISize::Make(fBounds.width(), fBounds.height()), 0);
+
+        // If the query contains the whole picture, don't bother with the bounding box hierarchy.
+        SkRect clipBounds;
+        pictureRecord.getClipBounds(&clipBounds);
+        SkBBoxHierarchy* bbh;
+        if (clipBounds.contains(fBounds)) {
+            bbh = nullptr;
+        } else {
+            bbh = fBBH.get();
+        }
+
+        // Record the draw commands.
+        pictureRecord.beginRecording();
+        SkRecordDraw(*fRecord, &pictureRecord, nullptr, fDrawableList->begin(),
+                fDrawableList->count(), bbh, nullptr);
+        pictureRecord.endRecording();
+
+        // Flatten the recorded commands and drawables.
+        SkPictureData pictureData(pictureRecord, info, false);
+        pictureData.flatten(buffer);
+    }
+
+    const char* getTypeName() const override {
+        return "SkRecordedDrawable";
+    }
 };
 
 sk_sp<SkDrawable> SkPictureRecorder::finishRecordingAsDrawable() {