Fix under-invalidation of frameset on resize

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 f9558e30b369b12c909c3d3a96fa0b9eb44efb66..389dbf5879e343401e9a210e4f3cd0d2a38aa162 100644
--- a/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
+++ b/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
@@ -158,6 +158,10 @@ PaintInvalidationReason BoxPaintInvalidator::computePaintInvalidationReason() {
       m_box.mustInvalidateBackgroundOrBorderPaintOnHeightChange())
     return PaintInvalidationBorderBoxChange;
 
+  // Needs to repaint frame boundaries.
+  if (m_box.isFrameSet())
+    return PaintInvalidationBorderBoxChange;
+
   return PaintInvalidationIncremental;
 }