Drop WebCoreInterpolationQualityToSkFilterQuality

Source/platform/graphics/GraphicsContextState.cpp

Index: Source/platform/graphics/GraphicsContextState.cpp
diff --git a/Source/platform/graphics/GraphicsContextState.cpp b/Source/platform/graphics/GraphicsContextState.cpp
index 0cc57a61bfb346634b90f2190aae994ecc03648e..e23ba5adcd71f7b37811e6ce595a743a237383fb 100644
--- a/Source/platform/graphics/GraphicsContextState.cpp
+++ b/Source/platform/graphics/GraphicsContextState.cpp
@@ -7,6 +7,15 @@
 
 namespace blink {
 
+static inline SkFilterQuality filterQualityForPaint(InterpolationQuality quality)
+{
+    // The filter quality "selected" here will primarily be used when painting a
+    // primitive using one of the SkPaints below. For the most part this will
+    // not affect things that are part of the Image class hierarchy (which use
+    // the unmodified m_interpolationQuality.)
+    return quality != InterpolationNone ? kLow_SkFilterQuality : kNone_SkFilterQuality;
+}
+
 GraphicsContextState::GraphicsContextState()
     : m_strokeColor(Color::black)
     , m_fillColor(Color::black)
@@ -21,10 +30,10 @@ GraphicsContextState::GraphicsContextState()
     m_strokePaint.setStrokeCap(SkPaint::kDefault_Cap);
     m_strokePaint.setStrokeJoin(SkPaint::kDefault_Join);
     m_strokePaint.setStrokeMiter(SkFloatToScalar(m_strokeData.miterLimit()));
-    m_strokePaint.setFilterQuality(WebCoreInterpolationQualityToSkFilterQuality(m_interpolationQuality));
+    m_strokePaint.setFilterQuality(filterQualityForPaint(m_interpolationQuality));
     m_strokePaint.setAntiAlias(m_shouldAntialias);
     m_fillPaint.setColor(m_fillColor.rgb());
-    m_fillPaint.setFilterQuality(WebCoreInterpolationQualityToSkFilterQuality(m_interpolationQuality));
+    m_fillPaint.setFilterQuality(filterQualityForPaint(m_interpolationQuality));
     m_fillPaint.setAntiAlias(m_shouldAntialias);
 }
 
@@ -155,8 +164,8 @@ void GraphicsContextState::setColorFilter(PassRefPtr<SkColorFilter> colorFilter)
 void GraphicsContextState::setInterpolationQuality(InterpolationQuality quality)
 {
     m_interpolationQuality = quality;
-    m_strokePaint.setFilterQuality(WebCoreInterpolationQualityToSkFilterQuality(quality));
-    m_fillPaint.setFilterQuality(WebCoreInterpolationQualityToSkFilterQuality(quality));
+    m_strokePaint.setFilterQuality(filterQualityForPaint(quality));
+    m_fillPaint.setFilterQuality(filterQualityForPaint(quality));
 }
 
 void GraphicsContextState::setShouldAntialias(bool shouldAntialias)