0 -> nullptr for UseCounter pointer in CSSParserContext.

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 374 matching lines @@
 String BaseRenderingContext2D::filter() const
 {
     return state().unparsedFilter();
 }
 
 void BaseRenderingContext2D::setFilter(const String& filterString)
 {
     if (filterString == state().unparsedFilter())
         return;
 
-    CSSValue* filterValue = CSSParser::parseSingleValue(CSSPropertyFilter, filterString, CSSParserContext(HTMLStandardMode, 0));
+    CSSValue* filterValue = CSSParser::parseSingleValue(CSSPropertyFilter, filterString, CSSParserContext(HTMLStandardMode, nullptr));
 
     if (!filterValue || filterValue->isInitialValue() || filterValue->isInheritedValue())
         return;
 
     modifiableState().setUnparsedFilter(filterString);
     modifiableState().setFilter(filterValue);
     snapshotStateForFilter();
 }
 
 SVGMatrixTearOff* BaseRenderingContext2D::currentTransform() const
@@ skipping 1173 matching lines @@
     numPatterns(0),
     numDrawWithComplexClips(0),
     numBlurredShadows(0),
     numFilters(0),
     numGetImageDataCalls(0),
     numPutImageDataCalls(0),
     numClearRectCalls(0),
     numDrawFocusCalls(0) {}
 
 } // namespace blink