Implement InterpolationMedium to filter animated images

Source/platform/graphics/GraphicsContextState.cpp

 // Copyright (c) 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 "platform/graphics/GraphicsContextState.h"
 
 namespace WebCore {
 
 GraphicsContextState::GraphicsContextState()
     : m_fillColor(Color::black)
     , m_fillRule(RULE_NONZERO)
     , m_textDrawingMode(TextModeFill)
     , m_alpha(256)
     , m_xferMode(nullptr)
     , m_compositeOperator(CompositeSourceOver)
     , m_blendMode(blink::WebBlendModeNormal)
-#if USE(LOW_QUALITY_IMAGE_INTERPOLATION)
-    , m_interpolationQuality(InterpolationLow)
-#else
-    , m_interpolationQuality(InterpolationHigh)
-#endif
+    , m_interpolationQuality(InterpolationDefault)
     , m_saveCount(0)
     , m_shouldAntialias(true)
     , m_shouldSmoothFonts(true)
     , m_shouldClampToSourceRect(true)
 {
     m_strokePaint.setStyle(SkPaint::kStroke_Style);
     m_strokePaint.setStrokeWidth(SkFloatToScalar(m_strokeData.thickness()));
     m_strokePaint.setColor(applyAlpha(m_strokeData.color().rgb()));
     m_strokePaint.setStrokeCap(SkPaint::kDefault_Cap);
     m_strokePaint.setStrokeJoin(SkPaint::kDefault_Join);
@@ skipping 212 matching lines @@
 
 void GraphicsContextState::setShouldAntialias(bool shouldAntialias)
 {
     m_shouldAntialias = shouldAntialias;
     m_strokePaint.setAntiAlias(shouldAntialias);
     m_fillPaint.setAntiAlias(shouldAntialias);
 }
 
 
 } // namespace WebCore