Enable fast/images with slimming paint

Source/core/paint/ViewDisplayList.cpp

Index: Source/core/paint/ViewDisplayList.cpp
diff --git a/Source/core/paint/ViewDisplayList.cpp b/Source/core/paint/ViewDisplayList.cpp
index 79de5be850f6466f2ca08201ac805baecd2dfc4d..a531565a5f2e227b364fba9d22a88d4064208c78 100644
--- a/Source/core/paint/ViewDisplayList.cpp
+++ b/Source/core/paint/ViewDisplayList.cpp
@@ -114,6 +114,44 @@ void ViewDisplayList::updatePaintList()
     m_paintListRenderers.swap(updatedRenderers);
 }
 
+DisplayItem::Type DisplayItem::paintPhaseToClipType(PaintPhase paintPhase)

[chrishtr, 2014/11/25 00:29:58]

IT's weird that this is in ViewDisplayList.cpp.

+{
+    switch (paintPhase) {
+    case PaintPhaseChildBlockBackgrounds:
+        return DisplayItem::ClipBoxChildBlockBackgrounds;
+        break;
+    case PaintPhaseFloat:
+        return DisplayItem::ClipBoxFloat;
+        break;
+    case PaintPhaseForeground:
+        return DisplayItem::ClipBoxChildBlockBackgrounds;
+        break;
+    case PaintPhaseChildOutlines:
+        return DisplayItem::ClipBoxChildOutlines;
+        break;
+    case PaintPhaseSelection:
+        return DisplayItem::ClipBoxSelection;
+        break;
+    case PaintPhaseCollapsedTableBorders:
+        return DisplayItem::ClipBoxCollapsedTableBorders;
+        break;
+    case PaintPhaseTextClip:
+        return DisplayItem::ClipBoxTextClip;
+        break;
+    case PaintPhaseClippingMask:
+        return DisplayItem::ClipBoxClippingMask;
+        break;
+    case PaintPhaseChildBlockBackground:
+    case PaintPhaseOutline:
+    case PaintPhaseBlockBackground:
+    case PaintPhaseSelfOutline:
+    case PaintPhaseMask:
+        ASSERT_NOT_REACHED();
+    }
+    // This should never happen.
+    return ClipBoxForeground;
+}
+
 #ifndef NDEBUG
 WTF::String DisplayItem::typeAsDebugString(DisplayItem::Type type)
 {
@@ -148,6 +186,7 @@ WTF::String DisplayItem::typeAsDebugString(DisplayItem::Type type)
     case DisplayItem::EndClip: return "EndClip";
     case DisplayItem::BeginFilter: return "BeginFilter";
     case DisplayItem::EndFilter: return "EndFilter";
+    case DisplayItem::TransparencyClip: return "TransparencyClip";
     case DisplayItem::BeginTransparency: return "BeginTransparency";
     case DisplayItem::EndTransparency: return "EndTransparency";
     case ClipBoxChildBlockBackgrounds: return "ClipBoxChildBlockBackgrounds";