blink: Add backdrop-filter support

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 68 matching lines @@
     bool hasRealizedFont() const { return m_realizedFont; }
     void setUnparsedFont(const String& font) { m_unparsedFont = font; }
     const String& unparsedFont() const { return m_unparsedFont; }
 
     void setFilter(PassRefPtrWillBeRawPtr<CSSValue>);
     void setUnparsedFilter(const String& filterString) { m_unparsedFilter = filterString; }
     const String& unparsedFilter() const { return m_unparsedFilter; }
     SkImageFilter* getFilter(Element*, const Font&) const;
     bool hasFilter() const { return m_filterValue; }
 
+    void setBackdropFilter(PassRefPtrWillBeRawPtr<CSSValue>);
+    void setUnparsedBackdropFilter(const String& filterString) { m_unparsedBackdropFilter = filterString; }
+    const String& unparsedBackdropFilter() const { return m_unparsedBackdropFilter; }
+    SkImageFilter* getBackdropFilter(Element*, const Font&) const;
+    bool hasBackdropFilter() const { return m_backdropFilterValue; }
+
     void setStrokeStyle(CanvasStyle*);
     CanvasStyle* strokeStyle() const { return m_strokeStyle.get(); }
 
     void setFillStyle(CanvasStyle*);
     CanvasStyle* fillStyle() const { return m_fillStyle.get(); }
 
     CanvasStyle* style(PaintType) const;
 
     enum Direction {
         DirectionInherit,
@@ skipping 97 matching lines @@
     Vector<float> m_lineDash;
     float m_lineDashOffset;
 
     String m_unparsedFont;
     Font m_font;
 
     String m_unparsedFilter;
     RefPtrWillBeMember<CSSValue> m_filterValue;
     mutable RefPtr<SkImageFilter> m_resolvedFilter;
 
+    String m_unparsedBackdropFilter;
+    RefPtrWillBeMember<CSSValue> m_backdropFilterValue;
+    mutable RefPtr<SkImageFilter> m_resolvedBackdropFilter;
+
     // 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;
 
     ClipList m_clipList;
 };
 
 } // blink
 
 #endif