Implement the framework for a paint property hierarchy

third_party/WebKit/Source/core/paint/PaintLayer.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayer.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayer.cpp b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
index 7bdb735193ca2461f26b4bd57ee7f2a799a1acd1..14d04fe6efb5744bb7b845a89423315496c6aa7a 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayer.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
@@ -72,6 +72,7 @@
 #include "core/page/Page.h"
 #include "core/page/scrolling/ScrollingCoordinator.h"
 #include "core/paint/FilterEffectBuilder.h"
+#include "core/paint/ObjectPaintProperties.h"
 #include "platform/LengthFunctions.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/TraceEvent.h"
@@ -2714,6 +2715,22 @@ void PaintLayer::markAncestorChainForNeedsRepaint()
     }
 }
 
+ObjectPaintProperties& PaintLayer::mutablePaintProperties()
+{
+    ASSERT(RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+    ASSERT(layoutObject()->document().lifecycle().state() == DocumentLifecycle::InUpdatePaintProperties);
+    if (!m_paintProperties)
+        m_paintProperties = ObjectPaintProperties::create();
+    return *m_paintProperties;
+}
+
+const ObjectPaintProperties* PaintLayer::paintProperties() const
+{
+    ASSERT(RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+    ASSERT(layoutObject()->document().lifecycle().state() == DocumentLifecycle::InPaint);
+    return m_paintProperties.get();
+}
+
 DisableCompositingQueryAsserts::DisableCompositingQueryAsserts()
     : m_disabler(gCompositingQueryMode, CompositingQueriesAreAllowed) { }