Make ECDSA the default certificate in WebRTC standalone

webrtc/base/sslidentity.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 96 matching lines @@
   }
 
   // Helper function for deleting a vector of certificates.
   static void DeleteCert(SSLCertificate* cert) { delete cert; }
 
   std::vector<SSLCertificate*> certs_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(SSLCertChain);
 };
 
-// KT_DEFAULT is currently an alias for KT_RSA.  This is likely to change.
 // KT_LAST is intended for vector declarations and loops over all key types;
 // it does not represent any key type in itself.
-enum KeyType { KT_RSA, KT_ECDSA, KT_LAST, KT_DEFAULT = KT_RSA };
+// KT_DEFAULT is used as the default KeyType for KeyParams.
+enum KeyType {
+  KT_RSA, KT_ECDSA, KT_LAST,
+#if defined(WEBRTC_BUILD_CHROMIUM)
+  // TODO(hbos): Because of an experiment running in Chromium which relies on
+  // RSA being the default (for performance reasons) we have this #if. ECDSA
+  // launches in Chromium by flipping a flag which overrides the default. As
+  // soon as the experiment has ended and there is no risk of RSA being the
+  // default we should make KT_DEFAULT = KT_ECDSA unconditionally.
+  // crbug.com/611698
+  KT_DEFAULT = KT_RSA
+#else
+  KT_DEFAULT = KT_ECDSA
+#endif
+};
 
 static const int kRsaDefaultModSize = 1024;
 static const int kRsaDefaultExponent = 0x10001;  // = 2^16+1 = 65537
 static const int kRsaMinModSize = 1024;
 static const int kRsaMaxModSize = 8192;
 
 // Certificate default validity lifetime.
 static const int kDefaultCertificateLifetimeInSeconds =
     60 * 60 * 24 * 30;  // 30 days
 // Certificate validity window.
@@ skipping 113 matching lines @@
 // |s| is not 0-terminated; its char count is defined by |length|.
 int64_t ASN1TimeToSec(const unsigned char* s, size_t length, bool long_format);
 
 extern const char kPemTypeCertificate[];
 extern const char kPemTypeRsaPrivateKey[];
 extern const char kPemTypeEcPrivateKey[];
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_SSLIDENTITY_H_