Fix crash in ObjectPainter::paintOutline in flipped blocks

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

Index: third_party/WebKit/Source/core/paint/ObjectPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/ObjectPainter.cpp b/third_party/WebKit/Source/core/paint/ObjectPainter.cpp
index 987f6806f4c3d7ee848cc3fcbfca6b8082752404..a05c989094b88d2990a5c49c1dd4e800af91561a 100644
--- a/third_party/WebKit/Source/core/paint/ObjectPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/ObjectPainter.cpp
@@ -211,8 +211,11 @@ void ObjectPainter::paintOutline(const PaintInfo& paintInfo, const LayoutPoint&
     // Block flipping is not applied yet if !m_layoutObject.isBox().
     if (!m_layoutObject.isBox() && m_layoutObject.styleRef().isFlippedBlocksWritingMode()) {
         LayoutBlock* container = m_layoutObject.containingBlock();
-        if (container)
+        if (container) {
             m_layoutObject.localToContainerRects(outlineRects, container, -paintOffset, paintOffset);
+            if (outlineRects.isEmpty())
+                return;
+        }
     }
 
     Vector<IntRect> pixelSnappedOutlineRects;