(WIP) Invalidation during painting (for synchronized painting)

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

Index: third_party/WebKit/Source/core/paint/SVGPaintContext.cpp
diff --git a/third_party/WebKit/Source/core/paint/SVGPaintContext.cpp b/third_party/WebKit/Source/core/paint/SVGPaintContext.cpp
index ad3c5adb69cd67877eb3062004714df7c570e760..a0e83f36142cc2e1165a7cf2b5402a202d51af50 100644
--- a/third_party/WebKit/Source/core/paint/SVGPaintContext.cpp
+++ b/third_party/WebKit/Source/core/paint/SVGPaintContext.cpp
@@ -27,6 +27,7 @@
 #include "core/frame/FrameHost.h"
 #include "core/layout/svg/LayoutSVGResourceFilter.h"
 #include "core/layout/svg/LayoutSVGResourceMasker.h"
+#include "core/layout/svg/LayoutSVGRoot.h"
 #include "core/layout/svg/SVGLayoutSupport.h"
 #include "core/layout/svg/SVGResources.h"
 #include "core/layout/svg/SVGResourcesCache.h"
@@ -228,4 +229,20 @@ bool SVGPaintContext::paintForLayoutObject(const PaintInfo& paintInfo, const Com
     return true;
 }
 
+void SVGPaintContext::initializePaintInvalidationState()
+{
+    ASSERT(RuntimeEnabledFeatures::slimmingPaintSynchronizedPaintingEnabled());
+
+    if (!m_originalPaintInfo->paintInvalidationState)
+        return;
+
+    if (m_object->isSVGRoot())
+        m_paintInvalidationState.emplace(*m_originalPaintInfo->paintInvalidationState, toLayoutBoxModelObject(*m_object), m_paintInfo.paintInvalidationState->paintInvalidationContainer());
+    else if (m_object->isSVGModelObject())
+        m_paintInvalidationState.emplace(*m_originalPaintInfo->paintInvalidationState, toLayoutSVGModelObject(*m_object));
+
+    if (m_paintInvalidationState)
+        m_paintInfo.paintInvalidationState = &*m_paintInvalidationState;
+}
+
 } // namespace blink