Avoid RenderObject::paintInvalidationForWholeRenderer() if possible

Source/core/editing/InputMethodController.cpp

Index: Source/core/editing/InputMethodController.cpp
diff --git a/Source/core/editing/InputMethodController.cpp b/Source/core/editing/InputMethodController.cpp
index 08778f48daedea147aad0a0ae59d776b1ed01eb3..9899d256aff7bace2f3bf59b69f44a52e4eb2149 100644
--- a/Source/core/editing/InputMethodController.cpp
+++ b/Source/core/editing/InputMethodController.cpp
@@ -305,7 +305,7 @@ void InputMethodController::setComposition(const String& text, const Vector<Comp
                 m_customCompositionUnderlines[i].endOffset += baseOffset;
             }
             if (baseNode->renderer())
-                baseNode->renderer()->paintInvalidationForWholeRenderer();
+                baseNode->renderer()->setShouldDoFullPaintInvalidation(true);
 
             unsigned start = std::min(baseOffset + selectionStart, extentOffset);
             unsigned end = std::min(std::max(start, baseOffset + selectionEnd), extentOffset);
@@ -340,7 +340,7 @@ void InputMethodController::setCompositionFromExistingText(const Vector<Composit
             m_customCompositionUnderlines[i].endOffset += m_compositionStart;
         }
         if (baseNode->renderer())
-            baseNode->renderer()->paintInvalidationForWholeRenderer();
+            baseNode->renderer()->setShouldDoFullPaintInvalidation(true);
         return;
     }