Use counter for mixing old and new constraints

third_party/WebKit/Source/modules/mediastream/MediaConstraintsImpl.cpp

 /*
  * Copyright (C) 2012 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 584 matching lines @@
     }
     constraints.initialize(constraintBuffer, advancedBuffer);
     return constraints;
 }
 
 WebMediaConstraints create(ExecutionContext* context, const MediaTrackConstraints& constraintsIn, MediaErrorState& errorState)
 {
     WebMediaConstraints standardForm = convertConstraintsToWeb(constraintsIn);
     if (constraintsIn.hasOptional() || constraintsIn.hasMandatory()) {
         if (!standardForm.isEmpty()) {
+            UseCounter::count(context, UseCounter::MediaStreamConstraintsOldAndNew);
             errorState.throwTypeError("Malformed constraint: Cannot use both optional/mandatory and specific or advanced constraints.");
             return WebMediaConstraints();
         }
         Vector<NameValueStringConstraint> optional;
         Vector<NameValueStringConstraint> mandatory;
         if (!parse(constraintsIn, optional, mandatory)) {
             errorState.throwTypeError("Malformed constraints object.");
             return WebMediaConstraints();
         }
         UseCounter::count(context, UseCounter::MediaStreamConstraintsNameValue);
@@ skipping 150 matching lines @@
         MediaTrackConstraintSet element;
         convertConstraintSet(it, element);
         advancedVector.append(element);
     }
     if (!advancedVector.isEmpty())
         output.setAdvanced(advancedVector);
 }
 
 } // namespace MediaConstraintsImpl
 } // namespace blink