Make canvas filters use the font size in effect when the filter is set

third_party/WebKit/Source/modules/canvas2d/BaseRenderingContext2D.h

 // Copyright 2016 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 BaseRenderingContext2D_h
 #define BaseRenderingContext2D_h
 
 #include "bindings/core/v8/UnionTypesCore.h"
 #include "bindings/modules/v8/UnionTypesModules.h"
 #include "modules/ModulesExport.h"
@@ skipping 130 matching lines @@
     virtual SkCanvas* drawingCanvas() const = 0;
     virtual SkCanvas* existingDrawingCanvas() const = 0;
     virtual void disableDeferral(DisableDeferralReason) = 0;
 
     virtual AffineTransform baseTransform() const = 0;
 
     virtual void didDraw(const SkIRect& dirtyRect) = 0;
 
     virtual bool stateHasFilter() = 0;
     virtual SkImageFilter* stateGetFilter() = 0;
+    virtual void snapshotStateForFilter() = 0;
 
     virtual void validateStateStack() = 0;
 
     virtual bool hasAlpha() const = 0;
 
     virtual bool isContextLost() const = 0;
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
@@ skipping 121 matching lines @@
     foregroundPaint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
     c->setMatrix(ctm);
     drawFunc(c, &foregroundPaint);
     c->restore();
     c->setMatrix(ctm);
 }
 
 } // namespace blink
 
 #endif // BaseRenderingContext2D_h