ViewPainter should skip background in print economy mode

Source/core/paint/TextPainterTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/TextPainter.h"
 
 #include "core/CSSPropertyNames.h"
 #include "core/CSSValueKeywords.h"
 #include "core/css/CSSPrimitiveValue.h"
@@ skipping 82 matching lines @@
     EXPECT_EQ(nullptr, textStyle.shadow);
 }
 
 TEST_F(TextPainterTest, TextPaintingStyle_ForceBackgroundToWhite_NoAdjustmentNeeded)
 {
     document().body()->setInlineStyleProperty(CSSPropertyWebkitTextFillColor, CSSValueRed);
     document().body()->setInlineStyleProperty(CSSPropertyWebkitTextStrokeColor, CSSValueLime);
     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(
         *layoutText(), layoutText()->styleRef(), false /* forceBlackText */, true /* isPrinting */);
     EXPECT_EQ(Color(255, 0, 0), textStyle.fillColor);
     EXPECT_EQ(Color(0, 255, 0), textStyle.strokeColor);
     EXPECT_EQ(Color(0, 0, 255), textStyle.emphasisMarkColor);
 }
 
 TEST_F(TextPainterTest, TextPaintingStyle_ForceBackgroundToWhite_Darkened)
 {
     document().body()->setInlineStyleProperty(CSSPropertyWebkitTextFillColor, "rgb(255, 220, 220)");
     document().body()->setInlineStyleProperty(CSSPropertyWebkitTextStrokeColor, "rgb(220, 255, 220)");
     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(
         *layoutText(), layoutText()->styleRef(), false /* forceBlackText */, true /* isPrinting */);
     EXPECT_EQ(Color(255, 220, 220).dark(), textStyle.fillColor);
     EXPECT_EQ(Color(220, 255, 220).dark(), textStyle.strokeColor);
     EXPECT_EQ(Color(220, 220, 255).dark(), textStyle.emphasisMarkColor);
 }
 
 } // namespace
 } // namespace blink