Repaint selection when element with ::selection style is recalculated.

third_party/WebKit/Source/core/style/ComputedStyle.cpp

Index: third_party/WebKit/Source/core/style/ComputedStyle.cpp
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.cpp b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
index bc38abc13cb784e065807157793231de423cbf34..60b10b21eafceb1e646e8b403750898d03b61cd6 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.cpp
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
@@ -572,6 +572,8 @@ StyleDifference ComputedStyle::visualInvalidationDiff(
     diff.setNeedsPaintInvalidationSubtree();
   else if (diffNeedsPaintInvalidationObject(other))
     diff.setNeedsPaintInvalidationObject();
+  else if (diffNeedsPaintInvalidationSelection(other))
+    diff.setNeedsPaintInvalidationSelection();
 
   updatePropertySpecificDifferences(other, diff);
 
@@ -1020,6 +1022,12 @@ bool ComputedStyle::diffNeedsPaintInvalidationObjectForPaintImage(
   return false;
 }
 
+bool ComputedStyle::diffNeedsPaintInvalidationSelection(
+    const ComputedStyle& other) const {
+  return hasPseudoStyle(PseudoIdSelection) ||
+         other.hasPseudoStyle(PseudoIdSelection);
+}
+
 void ComputedStyle::updatePropertySpecificDifferences(
     const ComputedStyle& other,
     StyleDifference& diff) const {