Add console errors and usecounter when srcset candidates are dropped

Source/core/html/parser/HTMLSrcsetParser.h

 /*
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 18 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef HTMLSrcsetParser_h
 #define HTMLSrcsetParser_h
 
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
+class Document;
+
 enum { UninitializedDescriptor = -1 };
 
 class DescriptorParsingResult {
 public:
     DescriptorParsingResult()
         : m_density(UninitializedDescriptor)
         , m_resourceWidth(UninitializedDescriptor)
         , m_resourceHeight(UninitializedDescriptor)
     {
     }
@@ skipping 73 matching lines @@
         return m_string.isEmpty();
     }
 
 private:
     StringView m_string;
     float m_density;
     int m_resourceWidth;
     OriginAttribute m_originAttribute;
 };
 
-ImageCandidate bestFitSourceForSrcsetAttribute(float deviceScaleFactor, float sourceSize, const String& srcsetAttribute);
+ImageCandidate bestFitSourceForSrcsetAttribute(float deviceScaleFactor, float sourceSize, const String& srcsetAttribute, Document* = nullptr);
 
-ImageCandidate bestFitSourceForImageAttributes(float deviceScaleFactor, float sourceSize, const String& srcAttribute, const String& srcsetAttribute);
+ImageCandidate bestFitSourceForImageAttributes(float deviceScaleFactor, float sourceSize, const String& srcAttribute, const String& srcsetAttribute, Document* = nullptr);
 
 String bestFitSourceForImageAttributes(float deviceScaleFactor, float sourceSize, const String& srcAttribute, ImageCandidate& srcsetImageCandidate);
 
 }
 
 #endif