Draw recorded content directly into the containing PaintCanvas, when possible.

third_party/WebKit/Source/platform/graphics/paint/PaintRecordBuilder.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/PaintRecordBuilder.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/PaintRecordBuilder.cpp b/third_party/WebKit/Source/platform/graphics/paint/PaintRecordBuilder.cpp
index c38eb19d187ddd65820a134a21ac2b9bcd9b16d2..4bafdd4157401ffdf52a48970b69a9fa829c4853 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/PaintRecordBuilder.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/PaintRecordBuilder.cpp
@@ -58,4 +58,13 @@ sk_sp<PaintRecord> PaintRecordBuilder::endRecording() {
   return m_context->endRecording();
 }
 
+void PaintRecordBuilder::endRecording(PaintCanvas& canvas) {
+  if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
+    canvas.drawPicture(endRecording());
+  } else {
+    m_paintController->commitNewDisplayItems();
+    m_paintController->paintArtifact().replay(m_bounds, canvas);
+  }
+}
+
 }  // namespace blink