Push selection gaps logic down to RenderBlockFlow

Source/core/paint/BlockFlowPainter.cpp

Index: Source/core/paint/BlockFlowPainter.cpp
diff --git a/Source/core/paint/BlockFlowPainter.cpp b/Source/core/paint/BlockFlowPainter.cpp
index 1a66ed50f7de6e847477edbffb7c1d4ed1425e0e..5b8d7f3ed6b6ea14050934b25bacd2f9e670eec1 100644
--- a/Source/core/paint/BlockFlowPainter.cpp
+++ b/Source/core/paint/BlockFlowPainter.cpp
@@ -8,6 +8,7 @@
 #include "core/rendering/FloatingObjects.h"
 #include "core/rendering/PaintInfo.h"
 #include "core/rendering/RenderBlockFlow.h"
+#include "core/rendering/RenderLayer.h"
 
 namespace blink {
 
@@ -44,4 +45,28 @@ void BlockFlowPainter::paintFloats(PaintInfo& paintInfo, const LayoutPoint& pain
     }
 }
 
+void BlockFlowPainter::paintSelection(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+{
+    if (m_renderBlockFlow.shouldPaintSelectionGaps() && paintInfo.phase == PaintPhaseForeground) {
+        LayoutUnit lastTop = 0;
+        LayoutUnit lastLeft = m_renderBlockFlow.logicalLeftSelectionOffset(&m_renderBlockFlow, lastTop);
+        LayoutUnit lastRight = m_renderBlockFlow.logicalRightSelectionOffset(&m_renderBlockFlow, lastTop);
+        GraphicsContextStateSaver stateSaver(*paintInfo.context);
+
+        LayoutRect gapRectsBounds = m_renderBlockFlow.selectionGaps(&m_renderBlockFlow, paintOffset, LayoutSize(), lastTop, lastLeft, lastRight, &paintInfo);
+        if (!gapRectsBounds.isEmpty()) {
+            RenderLayer* layer = m_renderBlockFlow.enclosingLayer();
+            gapRectsBounds.moveBy(-paintOffset);
+            if (!m_renderBlockFlow.hasLayer()) {
+                LayoutRect localBounds(gapRectsBounds);
+                m_renderBlockFlow.flipForWritingMode(localBounds);
+                gapRectsBounds = m_renderBlockFlow.localToContainerQuad(FloatRect(localBounds), layer->renderer()).enclosingBoundingBox();
+                if (layer->renderer()->hasOverflowClip())
+                    gapRectsBounds.move(layer->renderBox()->scrolledContentOffset());
+            }
+            layer->addBlockSelectionGapsBounds(gapRectsBounds);
+        }
+    }
+}
+
 } // namespace blink