Reland of Changed CSSParserContext argument from * to & for null safety.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPITouchAction.cpp

 // Copyright 2017 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 "core/css/properties/CSSPropertyAPITouchAction.h"
 
 #include "core/css/CSSValueList.h"
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
@@ skipping 18 matching lines @@
   } else {
     return false;
   }
   return true;
 }
 
 }  // namespace
 
 const CSSValue* CSSPropertyAPITouchAction::parseSingleValue(
     CSSParserTokenRange& range,
-    const CSSParserContext* context) {
+    const CSSParserContext& context) {
   CSSValueList* list = CSSValueList::createSpaceSeparated();
   CSSValueID id = range.peek().id();
   if (id == CSSValueAuto || id == CSSValueNone || id == CSSValueManipulation) {
     list->append(*CSSPropertyParserHelpers::consumeIdent(range));
     return list;
   }
 
   CSSValue* panX = nullptr;
   CSSValue* panY = nullptr;
   CSSValue* pinchZoom = nullptr;
   if (!consumePan(range, panX, panY, pinchZoom))
     return nullptr;
   if (!range.atEnd() && !consumePan(range, panX, panY, pinchZoom))
     return nullptr;
   if (!range.atEnd() && !consumePan(range, panX, panY, pinchZoom))
     return nullptr;
 
   if (panX)
     list->append(*panX);
   if (panY)
     list->append(*panY);
   if (pinchZoom)
     list->append(*pinchZoom);
   return list;
 }
 
 }  // namespace blink