Do not send redundant selectionchange-events (decouple focus)

third_party/WebKit/Source/core/editing/LayoutSelection.h

Index: third_party/WebKit/Source/core/editing/LayoutSelection.h
diff --git a/third_party/WebKit/Source/core/editing/LayoutSelection.h b/third_party/WebKit/Source/core/editing/LayoutSelection.h
index db981e09b0ed081b14676c869abf101c14952cfc..3b640344e4180d961c0b1b83c26b86dda5b4753b 100644
--- a/third_party/WebKit/Source/core/editing/LayoutSelection.h
+++ b/third_party/WebKit/Source/core/editing/LayoutSelection.h
@@ -33,12 +33,14 @@ class LayoutView;
 
 class LayoutSelection final : public GarbageCollected<LayoutSelection> {
  public:
+  enum class PaintHint { kHide, kKeep, kPaint };
+
   static LayoutSelection* Create(FrameSelection& frame_selection) {
     return new LayoutSelection(frame_selection);
   }
 
   bool HasPendingSelection() const { return has_pending_selection_; }
-  void SetHasPendingSelection() { has_pending_selection_ = true; }
+  void SetHasPendingSelection(PaintHint);
   void Commit(LayoutView&);
 
   IntRect SelectionBounds();
@@ -69,6 +71,7 @@ class LayoutSelection final : public GarbageCollected<LayoutSelection> {
 
   Member<FrameSelection> frame_selection_;
   bool has_pending_selection_ : 1;
+  bool force_hide_ : 1;
 
   // The current selection represented as 2 boundaries.
   // Selection boundaries are represented in LayoutView by a tuple