Return references to IntRects to save space in CompositingRequirementsUpdater.

third_party/WebKit/Source/core/paint/PaintLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 699 matching lines @@
   void updateAncestorDependentCompositingInputs(
       const AncestorDependentCompositingInputs&,
       const RareAncestorDependentCompositingInputs&,
       bool hasAncestorWithClipPath);
   void updateDescendantDependentCompositingInputs(
       bool hasDescendantWithClipPath,
       bool hasNonIsolatedDescendantWithBlendMode,
       bool hasRootScrollerAsDescendant);
   void didUpdateCompositingInputs();
 
-  IntRect clippedAbsoluteBoundingBox() const {
+  const IntRect& clippedAbsoluteBoundingBox() const {
     DCHECK(!m_needsAncestorDependentCompositingInputsUpdate);
     return m_ancestorDependentCompositingInputs.clippedAbsoluteBoundingBox;
   }
-  IntRect unclippedAbsoluteBoundingBox() const {
+  const IntRect& unclippedAbsoluteBoundingBox() const {
     DCHECK(!m_needsAncestorDependentCompositingInputsUpdate);
     return m_ancestorDependentCompositingInputs.unclippedAbsoluteBoundingBox;
   }
   const PaintLayer* opacityAncestor() const {
     DCHECK(!m_needsAncestorDependentCompositingInputsUpdate);
     return m_rareAncestorDependentCompositingInputs
                ? m_rareAncestorDependentCompositingInputs->opacityAncestor
                : nullptr;
   }
   const PaintLayer* transformAncestor() const {
@@ skipping 501 matching lines @@
 
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLayerTree(const blink::PaintLayer*);
 CORE_EXPORT void showLayerTree(const blink::LayoutObject*);
 #endif
 
 #endif  // Layer_h