[WIP][b:eae_mywip_paint] Paint Selection NG.

third_party/WebKit/Source/core/paint/NGBoxFragmentPainter.cpp

Index: third_party/WebKit/Source/core/paint/NGBoxFragmentPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/NGBoxFragmentPainter.cpp b/third_party/WebKit/Source/core/paint/NGBoxFragmentPainter.cpp
index f828559eb1563f5418a690e2a28323439aa386ea..a831a6c1203d2b3826b689cb22f40c6ee8f98a31 100644
--- a/third_party/WebKit/Source/core/paint/NGBoxFragmentPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/NGBoxFragmentPainter.cpp
@@ -44,6 +44,10 @@ void NGBoxFragmentPainter::PaintLineBox(
     const LayoutPoint& paint_offset) {
   // TODO: Should this check if the line boxes intersects with the dirty rect
   // like legacy layout or do we want to change the invalidation logic?
+  if (DrawingRecorder::UseCachedDrawingIfPossible(

[kojii, 2017/06/16 11:25:57]

Can explain what this is?

+          paint_info.context, *fragment,
+          DisplayItem::PaintPhaseToDrawingType(paint_info.phase)))
+    return;
 
   LayoutRect overflow_rect(box_fragment_->VisualOverflowRect());
   overflow_rect.MoveBy(paint_offset);