Use DrawingRecorder::canUseCachedDrawing

Source/core/paint/InlineFlowBoxPainter.cpp

Index: Source/core/paint/InlineFlowBoxPainter.cpp
diff --git a/Source/core/paint/InlineFlowBoxPainter.cpp b/Source/core/paint/InlineFlowBoxPainter.cpp
index 928eb67b6092cc5e6b951433573193835869397e..4266da52af1660555b57d49762a18998b4b31e5a 100644
--- a/Source/core/paint/InlineFlowBoxPainter.cpp
+++ b/Source/core/paint/InlineFlowBoxPainter.cpp
@@ -61,8 +61,9 @@ void InlineFlowBoxPainter::paint(const PaintInfo& paintInfo, const LayoutPoint&
             }
         }
     } else if (paintInfo.phase == PaintPhaseMask) {
-        RenderDrawingRecorder recorder(paintInfo.context, &m_inlineFlowBox.renderer(), paintInfo.phase, pixelSnappedIntRect(overflowRect));
-        paintMask(paintInfo, paintOffset);
+        RenderDrawingRecorder recorder(paintInfo.context, m_inlineFlowBox.renderer(), paintInfo.phase, pixelSnappedIntRect(overflowRect));
+        if (!recorder.canUseCachedDrawing())
+            paintMask(paintInfo, paintOffset);
         return;
     } else if (paintInfo.phase == PaintPhaseForeground) {
         // Paint our background, border and box-shadow.
@@ -212,7 +213,9 @@ void InlineFlowBoxPainter::paintBoxDecorationBackground(const PaintInfo& paintIn
 
     LayoutRect paintRect = LayoutRect(adjustedPaintOffset, frameRect.size());
 
-    RenderDrawingRecorder recorder(paintInfo.context, &m_inlineFlowBox.renderer(), paintInfo.phase, pixelSnappedIntRect(paintRect));
+    RenderDrawingRecorder recorder(paintInfo.context, m_inlineFlowBox.renderer(), paintInfo.phase, pixelSnappedIntRect(paintRect));
+    if (recorder.canUseCachedDrawing())
+        return;
 
     // Shadow comes first and is behind the background and border.
     if (!m_inlineFlowBox.boxModelObject()->boxShadowShouldBeAppliedToBackground(BackgroundBleedNone, &m_inlineFlowBox))