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

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

 // 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.
 
 #include "modules/canvas2d/BaseRenderingContext2D.h"
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/css/parser/CSSParser.h"
@@ skipping 365 matching lines @@
     if (filterString == state().unparsedFilter())
         return;
 
     CSSValue* filterValue = CSSParser::parseSingleValue(CSSPropertyWebkitFilter, filterString, CSSParserContext(HTMLStandardMode, 0));
 
     if (!filterValue || filterValue->isInitialValue() || filterValue->isInheritedValue())
         return;
 
     modifiableState().setUnparsedFilter(filterString);
     modifiableState().setFilter(filterValue);
+    snapshotStateForFilter();
 }
 
 SVGMatrixTearOff* BaseRenderingContext2D::currentTransform() const
 {
     return SVGMatrixTearOff::create(state().transform());
 }
 
 void BaseRenderingContext2D::setCurrentTransform(SVGMatrixTearOff* matrixTearOff)
 {
     const AffineTransform& transform = matrixTearOff->value();
@@ skipping 970 matching lines @@
 
     imageBuffer()->willOverwriteCanvas();
 }
 
 DEFINE_TRACE(BaseRenderingContext2D)
 {
     visitor->trace(m_stateStack);
 }
 
 } // namespace blink