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 34c56d65e6562dc8b404d9aaa7d16690874965c0..1beda05a99a34e67327c4d017ad361353f92d501 100644
--- a/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
+++ b/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
@@ -179,6 +179,10 @@ PaintInvalidationReason BoxPaintInvalidator::computePaintInvalidationReason() {
       m_box.mustInvalidateBackgroundOrBorderPaintOnHeightChange())
     return PaintInvalidationBorderBoxChange;
 
+  // Needs to repaint frame boundaries.
+  if (m_box.isFrameSet())
+    return PaintInvalidationBorderBoxChange;
+
   return PaintInvalidationIncremental;
 }