Only call paint property-requiring subroutines if there are actually properties.

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

 // Copyright 2015 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.
 
 #ifndef PaintPropertyTreeBuilder_h
 #define PaintPropertyTreeBuilder_h
 
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/graphics/paint/ClipPaintPropertyNode.h"
 #include "platform/graphics/paint/EffectPaintPropertyNode.h"
 #include "platform/graphics/paint/ScrollPaintPropertyNode.h"
 #include "platform/graphics/paint/TransformPaintPropertyNode.h"
 #include "platform/wtf/RefPtr.h"
 
 namespace blink {
 
 class FrameView;
 class LayoutBoxModelObject;
 class LayoutObject;
+class ObjectPaintProperties;
 
 // The context for PaintPropertyTreeBuilder.
 // It's responsible for bookkeeping tree state in other order, for example, the
 // most recent position container seen.
 struct PaintPropertyTreeBuilderFragmentContext {
   USING_FAST_MALLOC(PaintPropertyTreeBuilderFragmentContext);
 
  public:
   // Initializes all property tree nodes to the roots.
   PaintPropertyTreeBuilderFragmentContext();
@@ skipping 118 matching lines @@
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateForObjectLocationAndSize(
       const LayoutObject&,
       const LayoutObject* container_for_absolute_position,
       bool& is_actually_needed,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateTransform(
       const LayoutObject&,
+      ObjectPaintProperties&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateTransformForNonRootSVG(
       const LayoutObject&,
+      ObjectPaintProperties&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateEffect(
       const LayoutObject&,
+      ObjectPaintProperties&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateFilter(
       const LayoutObject&,
+      ObjectPaintProperties&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateCssClip(
       const LayoutObject&,
+      ObjectPaintProperties&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateLocalBorderBoxContext(
       const LayoutObject&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateScrollbarPaintOffset(
       const LayoutObject&,
+      ObjectPaintProperties&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateOverflowClip(
       const LayoutObject&,
+      ObjectPaintProperties&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdatePerspective(
       const LayoutObject&,
+      ObjectPaintProperties&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateSvgLocalToBorderBoxTransform(
       const LayoutObject&,
+      ObjectPaintProperties&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateScrollAndScrollTranslation(
       const LayoutObject&,
+      ObjectPaintProperties&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
   ALWAYS_INLINE static void UpdateOutOfFlowContext(
       const LayoutObject&,
       PaintPropertyTreeBuilderFragmentContext&,
       bool& force_subtree_update);
 
   // Ensure the ObjectPaintProperties object is created if it will be needed, or
   // cleared otherwise.
   ALWAYS_INLINE static void UpdatePaintProperties(
       const LayoutObject&,
       PaintPropertyTreeBuilderContext&);
 };
 
 }  // namespace blink
 
 #endif  // PaintPropertyTreeBuilder_h