Adds filter support for offscreen canvas

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DState.h

 // Copyright 2015 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.
 
 #ifndef CanvasRenderingContext2DState_h
 #define CanvasRenderingContext2DState_h
 
 #include "core/css/CSSFontSelectorClient.h"
 #include "modules/canvas2d/ClipList.h"
 #include "platform/fonts/Font.h"
@@ skipping 193 matching lines @@
     double m_globalAlpha;
     AffineTransform m_transform;
     Vector<double> m_lineDash;
     double m_lineDashOffset;
 
     String m_unparsedFont;
     Font m_font;
     Font m_fontForFilter;
 
     String m_unparsedFilter;
+public:
     Member<const CSSValue> m_filterValue;
     mutable sk_sp<SkImageFilter> m_resolvedFilter;
 
     // Text state.
     TextAlign m_textAlign;
     TextBaseline m_textBaseline;
     Direction m_direction;
 
     bool m_realizedFont : 1;
     bool m_isTransformInvertible : 1;
     bool m_hasClip : 1;
     bool m_hasComplexClip : 1;
     mutable bool m_fillStyleDirty : 1;
     mutable bool m_strokeStyleDirty : 1;
     mutable bool m_lineDashDirty : 1;
 
     bool m_imageSmoothingEnabled;
     SkFilterQuality m_imageSmoothingQuality;
 
     ClipList m_clipList;
 };
 
 } // namespace blink
 
 #endif