First step of PaintInvalidator implementation

third_party/WebKit/Source/core/layout/svg/LayoutSVGModelObject.cpp

Index: third_party/WebKit/Source/core/layout/svg/LayoutSVGModelObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/svg/LayoutSVGModelObject.cpp b/third_party/WebKit/Source/core/layout/svg/LayoutSVGModelObject.cpp
index d79f02b59511e53229332f91924c7fd288ad2246..519e723a1ae9a2a3ea66265dfbe162275e9dc7d9 100644
--- a/third_party/WebKit/Source/core/layout/svg/LayoutSVGModelObject.cpp
+++ b/third_party/WebKit/Source/core/layout/svg/LayoutSVGModelObject.cpp
@@ -36,6 +36,7 @@
 #include "core/layout/svg/SVGLayoutSupport.h"
 #include "core/layout/svg/SVGResourcesCache.h"
 #include "core/paint/PaintLayer.h"
+#include "core/paint/SVGModelObjectPaintInvalidator.h"
 #include "core/svg/SVGGraphicsElement.h"
 
 namespace blink {
@@ -88,18 +89,9 @@ void LayoutSVGModelObject::willBeDestroyed()
     LayoutObject::willBeDestroyed();
 }
 
-PaintInvalidationReason LayoutSVGModelObject::getPaintInvalidationReason(const PaintInvalidationState& paintInvalidationState,
-    const LayoutRect& oldBounds, const LayoutPoint& oldLocation, const LayoutRect& newBounds, const LayoutPoint& newLocation) const
+PaintInvalidationReason LayoutSVGModelObject::invalidatePaintIfNeeded(const PaintInvalidatorContext& context) const
 {
-    PaintInvalidationReason invalidationReason = LayoutObject::getPaintInvalidationReason(paintInvalidationState, oldBounds, oldLocation, newBounds, newLocation);
-
-    // Disable incremental invalidation for SVG objects to prevent under-
-    // invalidation. Unlike boxes, it is non-trivial (and rare) for SVG objects
-    // to be able to be incrementally invalidated (e.g., on height changes).
-    if (invalidationReason == PaintInvalidationIncremental)
-        return PaintInvalidationFull;
-
-    return invalidationReason;
+    return SVGModelObjectPaintInvalidator(*this, context).invalidatePaintIfNeeded();
 }
 
 void LayoutSVGModelObject::computeLayerHitTestRects(LayerHitTestRects& rects) const