ViewPainter should skip background in print economy mode

Source/core/paint/TextPainterTest.cpp

Index: Source/core/paint/TextPainterTest.cpp
diff --git a/Source/core/paint/TextPainterTest.cpp b/Source/core/paint/TextPainterTest.cpp
index 1f2e172914462a72c595209e1f77c790b0c2ae85..4aa6eab06a6600341041fa80ff2dcd8eb32138d2 100644
--- a/Source/core/paint/TextPainterTest.cpp
+++ b/Source/core/paint/TextPainterTest.cpp
@@ -100,6 +100,7 @@ TEST_F(TextPainterTest, TextPaintingStyle_ForceBackgroundToWhite_NoAdjustmentNee
     document().body()->setInlineStyleProperty(CSSPropertyWebkitTextEmphasisColor, CSSValueBlue);
     document().body()->setInlineStyleProperty(CSSPropertyWebkitPrintColorAdjust, CSSValueEconomy);
     document().settings()->setShouldPrintBackgrounds(false);
+    document().setPrinting(true);
     document().view()->updateLayoutAndStyleForPainting();
 
     TextPainter::Style textStyle = TextPainter::textPaintingStyle(
@@ -116,6 +117,7 @@ TEST_F(TextPainterTest, TextPaintingStyle_ForceBackgroundToWhite_Darkened)
     document().body()->setInlineStyleProperty(CSSPropertyWebkitTextEmphasisColor, "rgb(220, 220, 255)");
     document().body()->setInlineStyleProperty(CSSPropertyWebkitPrintColorAdjust, CSSValueEconomy);
     document().settings()->setShouldPrintBackgrounds(false);
+    document().setPrinting(true);
     document().view()->updateLayoutAndStyleForPainting();
 
     TextPainter::Style textStyle = TextPainter::textPaintingStyle(