Skip PaintPhaseFloat if no floats in a layer

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

Index: third_party/WebKit/Source/core/paint/PaintLayer.h
diff --git a/third_party/WebKit/Source/core/paint/PaintLayer.h b/third_party/WebKit/Source/core/paint/PaintLayer.h
index ea3b2c5b57b10e986e827ac614f4dee990235b36..54b6c312c9ef688da2684a24201395ada5aacfe4 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayer.h
+++ b/third_party/WebKit/Source/core/paint/PaintLayer.h
@@ -628,6 +628,10 @@ public:
     bool needsPaintPhaseDescendantOutlines() const { return m_needsPaintPhaseDescendantOutlines; }
     void setNeedsPaintPhaseDescendantOutlines() { ASSERT(isSelfPaintingLayer()); m_needsPaintPhaseDescendantOutlines = true; }
 
+    // Similar to above, but for PaintPhaseFloat.
+    bool needsPaintPhaseFloat() const { return m_needsPaintPhaseFloat; }
+    void setNeedsPaintPhaseFloat() { ASSERT(isSelfPaintingLayer()); m_needsPaintPhaseFloat = true; }
+
     PaintTiming* paintTiming();
 
 private:
@@ -761,6 +765,7 @@ private:
     unsigned m_previousPaintResult : 1; // PaintLayerPainter::PaintResult
 
     unsigned m_needsPaintPhaseDescendantOutlines : 1;
+    unsigned m_needsPaintPhaseFloat : 1;
 
     LayoutBoxModelObject* m_layoutObject;