Reland "SelectSettings algorithm for audio constraints."

third_party/WebKit/public/platform/WebMediaConstraints.h

Index: third_party/WebKit/public/platform/WebMediaConstraints.h
diff --git a/third_party/WebKit/public/platform/WebMediaConstraints.h b/third_party/WebKit/public/platform/WebMediaConstraints.h
index 7d8cbf213479635d50e60358f36b8a64f91c8d01..78692872888e4dad88d307335cf488856d644e0e 100644
--- a/third_party/WebKit/public/platform/WebMediaConstraints.h
+++ b/third_party/WebKit/public/platform/WebMediaConstraints.h
@@ -31,14 +31,15 @@
 #ifndef WebMediaConstraints_h
 #define WebMediaConstraints_h
 
+#include <string>
+#include <vector>
+
 #include "WebCommon.h"
 #include "WebNonCopyable.h"
 #include "WebPrivatePtr.h"
 #include "WebString.h"
 #include "WebVector.h"
 
-#include <vector>
-
 namespace blink {
 
 class WebMediaConstraintsPrivate;
@@ -167,6 +168,8 @@ class BLINK_PLATFORM_EXPORT StringConstraint : public BaseConstraint {
 
   void SetExact(const WebVector<WebString>& exact) { exact_.Assign(exact); }
 
+  void SetIdeal(const WebString& ideal) { ideal_.Assign(&ideal, 1); }
+
   void SetIdeal(const WebVector<WebString>& ideal) { ideal_.Assign(ideal); }
 
   bool Matches(WebString value) const;