Let padding change always trigger layout and full paint invalidation

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

Index: third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
diff --git a/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp b/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
index 23d2efba1c73b9e55b940bde70e1b4d325eaafe1..a7c502c1570aa4f3fa31d0fd87ab13256a9400a3 100644
--- a/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
+++ b/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
@@ -117,8 +117,7 @@ PaintInvalidationReason BoxPaintInvalidator::computePaintInvalidationReason() {
   const ComputedStyle& style = m_box.styleRef();
 
   if ((style.backgroundLayers().thisOrNextLayersUseContentBox() ||
-       style.maskLayers().thisOrNextLayersUseContentBox() ||
-       style.boxSizing() == EBoxSizing::kBorderBox) &&
+       style.maskLayers().thisOrNextLayersUseContentBox()) &&
       previousContentBoxRect() != m_box.contentBoxRect())
     return PaintInvalidationContentBoxChange;
 
@@ -319,11 +318,6 @@ bool BoxPaintInvalidator::needsToSavePreviousBoxGeometries() {
 
   const ComputedStyle& style = m_box.styleRef();
 
-  // If we use border-box sizing we need to track changes in the size of the
-  // content box.
-  if (style.boxSizing() == EBoxSizing::kBorderBox)
-    return true;
-
   // Background and mask layers can depend on other boxes than border box. See
   // crbug.com/490533
   if (style.backgroundLayers().thisOrNextLayersUseContentBox() ||