FrameSelection::updateApperance for caret should not cause layout.

Source/core/editing/FrameSelection.h

Index: Source/core/editing/FrameSelection.h
diff --git a/Source/core/editing/FrameSelection.h b/Source/core/editing/FrameSelection.h
index ebffebe35f6ffa60f3aa7b1f63c8f5b722ede3d2..b900d71d655bbccaf69b01603f9002365acae8e0 100644
--- a/Source/core/editing/FrameSelection.h
+++ b/Source/core/editing/FrameSelection.h
@@ -89,6 +89,10 @@ public:
         NonDirectional,
         Directional
     };
+    enum UpdateAppearanceOption {
+        None,
+        ResetCaretBlink
+    };
 
     Element* rootEditableElement() const { return m_selection.rootEditableElement(); }
     Element* rootEditableElementOrDocumentElement() const;
@@ -139,8 +143,8 @@ public:
     // Return the renderer that is responsible for painting the caret (in the selection start node)
     RenderBlock* caretRenderer() const;
 
-    // Caret rect local to the caret's renderer
-    LayoutRect localCaretRect();
+    // Update caret rect local to the caret's renderer
+    void updateLocalCaretRect();
     LayoutRect localCaretRectWithoutUpdateForTesting() const { return CaretBase::localCaretRectWithoutUpdate(); }
 
     // Bounds of (possibly transformed) caret in absolute coords
@@ -184,7 +188,7 @@ public:
     void pageActivationChanged();
 
     // Painting.
-    void updateAppearance();
+    void updateAppearance(UpdateAppearanceOption = None);
 
     void updateSecureKeyboardEntryIfActive();