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 77 matching lines @@
   void setFontForFilter(const Font& font) { m_fontForFilter = font; }
 
   void setFilter(const CSSValue*);
   void setUnparsedFilter(const String& filterString) {
     m_unparsedFilter = filterString;
   }
   const String& unparsedFilter() const { return m_unparsedFilter; }
   sk_sp<SkImageFilter> getFilter(Element*,
                                  IntSize canvasSize,
                                  CanvasRenderingContext2D*) const;
+  sk_sp<SkImageFilter> getFilterForOffscreenCanvas(IntSize canvasSize) const;
+  bool hasFilterForOffscreenCanvas(IntSize canvasSize) const;
   bool hasFilter(Element*, IntSize canvasSize, CanvasRenderingContext2D*) const;
   void clearResolvedFilter() const;
 
   void setStrokeStyle(CanvasStyle*);
   CanvasStyle* strokeStyle() const { return m_strokeStyle.get(); }
 
   void setFillStyle(CanvasStyle*);
   CanvasStyle* fillStyle() const { return m_fillStyle.get(); }
 
   CanvasStyle* style(PaintType) const;
@@ skipping 137 matching lines @@
 
   bool m_imageSmoothingEnabled;
   SkFilterQuality m_imageSmoothingQuality;
 
   ClipList m_clipList;
 };
 
 }  // namespace blink
 
 #endif