RTCCertificate serialization.

webrtc/base/fakesslidentity.h

Index: webrtc/base/fakesslidentity.h
diff --git a/webrtc/base/fakesslidentity.h b/webrtc/base/fakesslidentity.h
index 47ff86d03a827ebdf3a9a72f0bb6bf65ae278609..acce8844744ac1e16f061af681efdad060894898 100644
--- a/webrtc/base/fakesslidentity.h
+++ b/webrtc/base/fakesslidentity.h
@@ -98,6 +98,16 @@ class FakeSSLIdentity : public rtc::SSLIdentity {
     return new FakeSSLIdentity(*this);
   }
   virtual const FakeSSLCertificate& certificate() const { return cert_; }
+  virtual std::string PrivateKeyToPemString() const {
+    // Not implemented.
+    RTC_NOTREACHED();
+    return "";
+  }
+  virtual bool operator==(const SSLIdentity& other) const {
+    // Not implemented.
+    RTC_NOTREACHED();
+    return false;
+  }
  private:
   FakeSSLCertificate cert_;
 };