Reland "SelectSettings algorithm for audio constraints."

content/renderer/media/media_stream_constraints_util_sets.cc

 // 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 "content/renderer/media/media_stream_constraints_util_sets.h"
 
 #include <cmath>
 
 #include "content/renderer/media/media_stream_constraints_util.h"
 #include "third_party/WebKit/public/platform/WebMediaConstraints.h"
@@ skipping 515 matching lines @@
     const blink::WebMediaTrackConstraintSet& constraint_set) {
   return ResolutionSet(
       MinDimensionFromConstraint(constraint_set.height),
       MaxDimensionFromConstraint(constraint_set.height),
       MinDimensionFromConstraint(constraint_set.width),
       MaxDimensionFromConstraint(constraint_set.width),
       MinAspectRatioFromConstraint(constraint_set.aspect_ratio),
       MaxAspectRatioFromConstraint(constraint_set.aspect_ratio));
 }
 
+DiscreteSet<std::string> StringSetFromConstraint(
+    const blink::StringConstraint& constraint) {
+  if (!constraint.HasExact())
+    return DiscreteSet<std::string>::UniversalSet();
+
+  std::vector<std::string> elements;
+  for (const auto& entry : constraint.Exact())
+    elements.push_back(entry.Ascii());
+
+  return DiscreteSet<std::string>(std::move(elements));
+}
+
+DiscreteSet<bool> BoolSetFromConstraint(
+    const blink::BooleanConstraint& constraint) {
+  if (!constraint.HasExact())
+    return DiscreteSet<bool>::UniversalSet();
+
+  return DiscreteSet<bool>({constraint.Exact()});
+}
+
 }  // namespace content