Clip scrollbars to box bounds when they don't fit.

third_party/WebKit/Source/platform/graphics/paint/DisplayItem.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/graphics/paint/DisplayItem.h"
 
 namespace blink {
 
 struct SameSizeAsDisplayItem {
@@ skipping 122 matching lines @@
         DEBUG_STRING_CASE(ClipFrameToVisibleContentRect);
         DEBUG_STRING_CASE(ClipFrameScrollbars);
         DEBUG_STRING_CASE(ClipLayerBackground);
         DEBUG_STRING_CASE(ClipLayerColumnBounds);
         DEBUG_STRING_CASE(ClipLayerFilter);
         DEBUG_STRING_CASE(ClipLayerForeground);
         DEBUG_STRING_CASE(ClipLayerParent);
         DEBUG_STRING_CASE(ClipLayerOverflowControls);
         DEBUG_STRING_CASE(ClipNodeImage);
         DEBUG_STRING_CASE(ClipPopupListBoxFrame);
+        DEBUG_STRING_CASE(ClipScrollbarsToBoxBounds);
         DEBUG_STRING_CASE(ClipSelectionImage);
         DEBUG_STRING_CASE(PageWidgetDelegateClip);
         DEBUG_STRING_CASE(ClipPrintedPage);
         DEFAULT_CASE;
     }
 }
 
 static String transform3DTypeAsDebugString(DisplayItem::Type type)
 {
     switch (type) {
@@ skipping 79 matching lines @@
     stringBuilder.append('"');
     if (m_skippedCache)
         stringBuilder.append(", skippedCache: true");
     if (m_scope)
         stringBuilder.append(String::format(", scope: %d", m_scope));
 }
 
 #endif
 
 } // namespace blink