Add UseCounter for border-image overriding border-widths

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

Index: third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp b/third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp
index c72e025e71b6011abc6bfd8bf04bb923ded1f844..2cea06bfeb6c64961db847bbdb3006749953462c 100644
--- a/third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp
+++ b/third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp
@@ -5,6 +5,7 @@
 #include "config.h"
 #include "core/paint/NinePieceImagePainter.h"
 
+#include "core/frame/UseCounter.h"
 #include "core/layout/ImageQualityController.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/paint/BoxPainter.h"
@@ -35,6 +36,12 @@ bool NinePieceImagePainter::paint(GraphicsContext* graphicsContext, const Layout
     if (!styleImage->canRender(m_layoutObject, style.effectiveZoom()))
         return false;
 
+    if ((style.borderLeftWidth() && style.borderLeft().style() == BNONE)

[philipj_slow, 2015/11/18 09:28:58]

Comment that these conditions are meant to isolate whether the
!m_image.hasImage() part of borderLeftWidth() had any effect, as that's the only
way that border-style:none does not imply border-width:0.

Also, should BHIDDEN be included here?

+        || (style.borderRightWidth() && style.borderRight().style() == BNONE)
+        || (style.borderTopWidth() && style.borderTop().style() == BNONE)
+        || (style.borderBottomWidth() && style.borderBottom().style() == BNONE))
+        UseCounter::count(m_layoutObject.document(), UseCounter::BorderImageWithBorderStyleNone);
+
     // FIXME: border-image is broken with full page zooming when tiling has to happen, since the tiling function
     // doesn't have any understanding of the zoom that is in effect on the tile.
     LayoutRect rectWithOutsets = rect;