Refactor to centralize code which decides whether ObjectPaintProperties are needed.

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

Index: third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h
diff --git a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h
index b86ac35b42a4954b3cf3c7ad1a5bc522444aaea4..3441c17680c76bac5688092dd3cbaeb7312076cb 100644
--- a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h
+++ b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h
@@ -161,6 +161,8 @@ class PaintPropertyTreeBuilder {
   ALWAYS_INLINE static void UpdateOutOfFlowContext(
       const LayoutObject&,
       PaintPropertyTreeBuilderContext&);
+
+  ALWAYS_INLINE static void UpdatePaintProperties(const LayoutObject&);

[pdr., 2017/04/20 22:56:28]

Can you add a comment here? Something like:
// Ensure the ObjectPaintProperties object is created if it will be needed, or
cleared otherwise.

[chrishtr, 2017/04/21 01:20:02]

Done.

 };
 
 }  // namespace blink