Expand the clip rect for cull rect verification.

Source/platform/graphics/paint/DrawingRecorder.cpp

Index: Source/platform/graphics/paint/DrawingRecorder.cpp
diff --git a/Source/platform/graphics/paint/DrawingRecorder.cpp b/Source/platform/graphics/paint/DrawingRecorder.cpp
index 7395b4e971e71726c817aee7b481945d5fcd16bc..34b43b3b99dd704803043d5ba30baaffd5a1f975 100644
--- a/Source/platform/graphics/paint/DrawingRecorder.cpp
+++ b/Source/platform/graphics/paint/DrawingRecorder.cpp
@@ -54,7 +54,13 @@ DrawingRecorder::DrawingRecorder(GraphicsContext& context, const DisplayItemClie
         // cull rect clipping is enabled, make this explicit. This allows us to identify potential
         // incorrect cull rects that might otherwise be masked due to Skia internal optimizations.
         context.save();
-        context.clipRect(enclosingIntRect(cullRect), NotAntiAliased, SkRegion::kIntersect_Op);
+        IntRect verificationClip = enclosingIntRect(cullRect);
+        // Expand the verification clip by one pixel to account for Skia's SkCanvas::getClipBounds()
+        // expansion, used in testing cull rects.
+        // TODO(schenney) This is not the best place to do this. Ideally, we would expand by one pixel
+        // in device (pixel) space, but to do that we would need to add the verification mode to Skia.
+        verificationClip.inflate(1);
+        context.clipRect(verificationClip, NotAntiAliased, SkRegion::kIntersect_Op);
     }
 #endif
 }