Enable fast/images with slimming paint

Source/core/paint/BoxClipper.cpp

Index: Source/core/paint/BoxClipper.cpp
diff --git a/Source/core/paint/BoxClipper.cpp b/Source/core/paint/BoxClipper.cpp
index 2459899c7d3eb15a458fe708bfc0b83ba7dc6b5b..d40fe619f4cc663c4cb615a3b147833f5aceb882 100644
--- a/Source/core/paint/BoxClipper.cpp
+++ b/Source/core/paint/BoxClipper.cpp
@@ -63,38 +63,7 @@ BoxClipper::BoxClipper(RenderBox& box, PaintInfo& paintInfo, const LayoutPoint&
 
     DisplayItem::Type clipType = DisplayItem::ClipBoxForeground;
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
-        switch (m_paintInfo.phase) {
-        case PaintPhaseChildBlockBackgrounds:
-            clipType = DisplayItem::ClipBoxChildBlockBackgrounds;
-            break;
-        case PaintPhaseFloat:
-            clipType = DisplayItem::ClipBoxFloat;
-            break;
-        case PaintPhaseForeground:
-            clipType = DisplayItem::ClipBoxChildBlockBackgrounds;
-            break;
-        case PaintPhaseChildOutlines:
-            clipType = DisplayItem::ClipBoxChildOutlines;
-            break;
-        case PaintPhaseSelection:
-            clipType = DisplayItem::ClipBoxSelection;
-            break;
-        case PaintPhaseCollapsedTableBorders:
-            clipType = DisplayItem::ClipBoxCollapsedTableBorders;
-            break;
-        case PaintPhaseTextClip:
-            clipType = DisplayItem::ClipBoxTextClip;
-            break;
-        case PaintPhaseClippingMask:
-            clipType = DisplayItem::ClipBoxClippingMask;
-            break;
-        case PaintPhaseChildBlockBackground:
-        case PaintPhaseOutline:
-        case PaintPhaseBlockBackground:
-        case PaintPhaseSelfOutline:
-        case PaintPhaseMask:
-            ASSERT_NOT_REACHED();
-        }
+        clipType = DisplayItem::paintPhaseToClipType(m_paintInfo.phase);
     }
 
     OwnPtr<ClipDisplayItem> clipDisplayItem = adoptPtr(new ClipDisplayItem(&m_box, clipType, pixelSnappedIntRect(clipRect)));