Separate repaint and layout requirements of StyleDifference (Step 1)

Source/core/rendering/style/RenderStyleConstants.h

Index: Source/core/rendering/style/RenderStyleConstants.h
diff --git a/Source/core/rendering/style/RenderStyleConstants.h b/Source/core/rendering/style/RenderStyleConstants.h
index 5efade95d908501ebf1c0578740ca485c7159bc8..a063b9ec5bd9abe64a1dde6bf5258ffb896f7ad1 100644
--- a/Source/core/rendering/style/RenderStyleConstants.h
+++ b/Source/core/rendering/style/RenderStyleConstants.h
@@ -44,41 +44,6 @@ enum PrintColorAdjust {
     PrintColorAdjustExact
 };
 
-// The difference between two styles.  The following values are used:
-// - StyleDifferenceEqual - The two styles are identical.
-//   FIXME: When style difference is context sensitive, RenderStyle::visualInvalidationDiff() may return
-//   StyleDifferenceEqual even there is difference. Will resolve the issue when fixing crbug.com/358460.
-// - StyleDifferenceRecompositeLayer - The layer needs its position and transform updated, but no repaint.
-// - StyleDifferenceRepaint - The object just needs to be repainted.
-// - StyleDifferenceRepaintLayer - The layer and its descendant layers need to be repainted.
-// - StyleDifferenceLayoutPositionedMovementOnly - Only the position of this positioned object has been updated.
-// - StyleDifferenceSimplifiedLayout - Only overflow needs to be recomputed.
-// - StyleDifferenceSimplifiedLayoutAndPositionedMovement - Both positioned movement and simplified layout updates are required.
-// - StyleDifferenceLayout - A full layout is required.
-enum StyleDifference {
-    StyleDifferenceEqual,
-    StyleDifferenceRecompositeLayer,
-    StyleDifferenceRepaint,
-    StyleDifferenceRepaintLayer,
-    StyleDifferenceLayoutPositionedMovementOnly,
-    StyleDifferenceSimplifiedLayout,
-    StyleDifferenceSimplifiedLayoutAndPositionedMovement,
-    StyleDifferenceLayout
-};
-
-// When some style properties change, different amounts of work have to be done depending on
-// context (e.g. whether the property is changing on an element which has a compositing layer).
-// A simple StyleDifference does not provide enough information so we return a bit mask of
-// StyleDifferenceContextSensitiveProperties from RenderStyle::visualInvalidationDiff() too.
-enum StyleDifferenceContextSensitiveProperty {
-    ContextSensitivePropertyNone = 0,
-    ContextSensitivePropertyTransform = (1 << 0),
-    ContextSensitivePropertyOpacity = (1 << 1),
-    ContextSensitivePropertyFilter = (1 << 2),
-    // The object needs to be repainted if it contains text or properties dependent on color (e.g., border or outline).
-    ContextSensitivePropertyTextOrColor = (1 << 3)
-};
-
 // Static pseudo styles. Dynamic ones are produced on the fly.
 enum PseudoId {
     // The order must be NOP ID, public IDs, and then internal IDs.