Paint flex items atomically, like inline-blocks

Source/core/rendering/InlineBox.cpp

Index: Source/core/rendering/InlineBox.cpp
diff --git a/Source/core/rendering/InlineBox.cpp b/Source/core/rendering/InlineBox.cpp
index bfd9db658ecabfab5fee8a714dd84e49622eeb2c..5015173f7f5618bdc90ae31f68aaedca60243107 100644
--- a/Source/core/rendering/InlineBox.cpp
+++ b/Source/core/rendering/InlineBox.cpp
@@ -197,30 +197,14 @@ void InlineBox::adjustPosition(float dx, float dy)
 
 void InlineBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit /* lineTop */, LayoutUnit /*lineBottom*/)
 {
-    if (!paintInfo.shouldPaintWithinRoot(renderer()) || (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection))
+    if (!paintInfo.shouldPaintWithinRoot(renderer()))
         return;
 
     LayoutPoint childPoint = paintOffset;
     if (parent()->renderer()->style()->isFlippedBlocksWritingMode()) // Faster than calling containingBlock().
         childPoint = renderer()->containingBlock()->flipForWritingModeForChild(toRenderBox(renderer()), childPoint);
 
-    // Paint all phases of replaced elements atomically, as though the replaced element established its
-    // own stacking context.  (See Appendix E.2, section 6.4 on inline block/table elements in the CSS2.1
-    // specification.)
-    bool preservePhase = paintInfo.phase == PaintPhaseSelection || paintInfo.phase == PaintPhaseTextClip;
-    PaintInfo info(paintInfo);
-    info.phase = preservePhase ? paintInfo.phase : PaintPhaseBlockBackground;
-    renderer()->paint(info, childPoint);
-    if (!preservePhase) {
-        info.phase = PaintPhaseChildBlockBackgrounds;
-        renderer()->paint(info, childPoint);
-        info.phase = PaintPhaseFloat;
-        renderer()->paint(info, childPoint);
-        info.phase = PaintPhaseForeground;
-        renderer()->paint(info, childPoint);
-        info.phase = PaintPhaseOutline;
-        renderer()->paint(info, childPoint);
-    }
+    RenderBlock::paintAsInlineBlock(renderer(), paintInfo, childPoint);
 }
 
 bool InlineBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit /* lineTop */, LayoutUnit /*lineBottom*/)