Use DrawingRecorder::canUseCachedDrawing

Source/core/paint/BoxPainter.cpp

Index: Source/core/paint/BoxPainter.cpp
diff --git a/Source/core/paint/BoxPainter.cpp b/Source/core/paint/BoxPainter.cpp
index 6044ebb7427cb00aaab132ea3bc1f481f32c6b15..ce09539312785250cfa6a991912f5b5ddea93855 100644
--- a/Source/core/paint/BoxPainter.cpp
+++ b/Source/core/paint/BoxPainter.cpp
@@ -69,11 +69,13 @@ LayoutRect BoxPainter::boundsForDrawingRecorder(const LayoutPoint& paintOffset)
 
 void BoxPainter::paintBoxDecorationBackgroundWithRect(const PaintInfo& paintInfo, const LayoutPoint& paintOffset, const LayoutRect& paintRect)
 {
+    RenderDrawingRecorder recorder(paintInfo.context, m_renderBox, paintInfo.phase, boundsForDrawingRecorder(paintOffset));
+    if (recorder.canUseCachedDrawing())
+        return;
+
     RenderStyle* style = m_renderBox.style();
     BoxDecorationData boxDecorationData(*style, m_renderBox.canRenderBorderImage(), m_renderBox.backgroundHasOpaqueTopLayer(), m_renderBox.backgroundShouldAlwaysBeClipped(), paintInfo.context);
 
-    RenderDrawingRecorder recorder(paintInfo.context, &m_renderBox, paintInfo.phase, boundsForDrawingRecorder(paintOffset));
-
     // FIXME: Should eventually give the theme control over whether the box shadow should paint, since controls could have
     // custom shadows of their own.
     if (!m_renderBox.boxShadowShouldBeAppliedToBackground(boxDecorationData.bleedAvoidance()))