Implement GetChain for OpenSSLCertificate.

rtc_base/opensslidentity.h

Index: rtc_base/opensslidentity.h
diff --git a/rtc_base/opensslidentity.h b/rtc_base/opensslidentity.h
index e4a790e48e89c49cebefa68781f114c07fdf333b..a294d9d144558243d6ef2988d0e6f6d902a8026d 100644
--- a/rtc_base/opensslidentity.h
+++ b/rtc_base/opensslidentity.h
@@ -16,6 +16,7 @@
 
 #include <memory>
 #include <string>
+#include <vector>
 
 #include "rtc_base/checks.h"
 #include "rtc_base/constructormagic.h"
@@ -36,8 +37,7 @@ class OpenSSLKeyPair {
   static OpenSSLKeyPair* Generate(const KeyParams& key_params);
   // Constructs a key pair from the private key PEM string. This must not result
   // in missing public key parameters. Returns null on error.
-  static OpenSSLKeyPair* FromPrivateKeyPEMString(
-      const std::string& pem_string);
+  static OpenSSLKeyPair* FromPrivateKeyPEMString(const std::string& pem_string);
 
   virtual ~OpenSSLKeyPair();
 
@@ -62,9 +62,10 @@ class OpenSSLKeyPair {
 class OpenSSLCertificate : public SSLCertificate {
  public:
   // Caller retains ownership of the X509 object.
-  explicit OpenSSLCertificate(X509* x509) : x509_(x509) {
-    AddReference();
-  }
+  explicit OpenSSLCertificate(X509* x509);
+
+  // Caller retains owership of STACK_OF(X509).
+  explicit OpenSSLCertificate(STACK_OF(X509) * chain);
 
   static OpenSSLCertificate* Generate(OpenSSLKeyPair* key_pair,
                                       const SSLIdentityParams& params);
@@ -75,6 +76,7 @@ class OpenSSLCertificate : public SSLCertificate {
   OpenSSLCertificate* GetReference() const override;
 
   X509* x509() const { return x509_; }
+  X509* GetX509Reference() const;
 
   std::string ToPEMString() const override;
   void ToDER(Buffer* der_buffer) const override;
@@ -100,9 +102,11 @@ class OpenSSLCertificate : public SSLCertificate {
   int64_t CertificateExpirationTime() const override;
 
  private:
-  void AddReference() const;
+  void AddReference(X509* x509) const;
 
   X509* x509_;
+  // Non-leaf certificate chain.
+  std::vector<SSLCertificate*> cert_chain_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(OpenSSLCertificate);
 };
@@ -141,7 +145,6 @@ class OpenSSLIdentity : public SSLIdentity {
   RTC_DISALLOW_COPY_AND_ASSIGN(OpenSSLIdentity);
 };
 
-
 }  // namespace rtc
 
 #endif  // RTC_BASE_OPENSSLIDENTITY_H_