RTCCertificate serialization.

webrtc/base/sslidentity.h

Index: webrtc/base/sslidentity.h
diff --git a/webrtc/base/sslidentity.h b/webrtc/base/sslidentity.h
index 77c9e186c1cb452c0accc4c9d4fb7cafa4ab8603..782b062d4d44c6b5f0f56eee5a93ef7af35ed48a 100644
--- a/webrtc/base/sslidentity.h
+++ b/webrtc/base/sslidentity.h
@@ -226,6 +226,7 @@ class SSLIdentity {
 
   // Returns a temporary reference to the certificate.
   virtual const SSLCertificate& certificate() const = 0;
+  virtual std::string PrivateKeyToPemString() const = 0;
 
   // Helpers for parsing converting between PEM and DER format.
   static bool PemToDer(const std::string& pem_type,
@@ -236,6 +237,8 @@ class SSLIdentity {
                               size_t length);
 };
 
+bool operator==(const SSLIdentity& a, const SSLIdentity& b);
+
 // Convert from ASN1 time as restricted by RFC 5280 to seconds from 1970-01-01
 // 00.00 ("epoch").  If the ASN1 time cannot be read, return -1.  The data at
 // |s| is not 0-terminated; its char count is defined by |length|.