Perf test for changing bit masks into switch statements in LayoutObject

third_party/WebKit/Source/core/layout/LayoutObject.h

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index 6a4a5b07426a76c3decd8b6bec230ff82b425a26..a1cee838f2673a2ca7ee80c1b08f573cb678d966 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -2432,24 +2432,7 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
     void setPositionedState(int positionState) {
       // This maps FixedPosition and AbsolutePosition to
       // IsOutOfFlowPositioned, saving one bit.
-      switch (positionState) {
-        case StaticPosition:
-          m_positionedState = IsStaticallyPositioned;
-          break;
-        case RelativePosition:
-          m_positionedState = IsRelativelyPositioned;
-          break;
-        case AbsolutePosition:
-        case FixedPosition:
-          m_positionedState = IsOutOfFlowPositioned;
-          break;
-        case StickyPosition:
-          m_positionedState = IsStickyPositioned;
-          break;
-        default:
-          NOTREACHED();
-          break;
-      }
+      m_positionedState = static_cast<PositionedState>(positionState & 0x3);
     }
     void clearPositionedState() { m_positionedState = StaticPosition; }