Implement an openssl version of a QUIC ProofSource.

net/quic/crypto/proof_source_chromium.h

Index: net/quic/crypto/proof_source_chromium.h
diff --git a/net/quic/crypto/proof_source_chromium.h b/net/quic/crypto/proof_source_chromium.h
index 45deb66c68748e9afcb8320f3244e50c0347237c..ef5e6768c3419891d59126ac6808716e11349654 100644
--- a/net/quic/crypto/proof_source_chromium.h
+++ b/net/quic/crypto/proof_source_chromium.h
@@ -10,7 +10,10 @@
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/files/file_util.h"
+#include "crypto/rsa_private_key.h"
 #include "net/base/net_export.h"
+#include "net/cert/x509_certificate.h"
 #include "net/quic/crypto/proof_source.h"
 
 namespace net {
@@ -20,7 +23,12 @@ namespace net {
 class NET_EXPORT_PRIVATE ProofSourceChromium : public ProofSource {
  public:
   ProofSourceChromium();
-  ~ProofSourceChromium() override {}
+  ~ProofSourceChromium() override;
+
+  // Initializes this object based on the certificate chain in |cert_path|,
+  // and the PKCS#8 RSA private key in |key_path|.
+  bool Initialize(const base::FilePath& cert_path,
+                  const base::FilePath& key_path);
 
   // ProofSource interface
   bool GetProof(const IPAddressNumber& server_ip,
@@ -31,6 +39,9 @@ class NET_EXPORT_PRIVATE ProofSourceChromium : public ProofSource {
                 std::string* out_signature) override;
 
  private:
+  scoped_ptr<crypto::RSAPrivateKey> private_key_;
+  std::vector<std::string> certificates_;
+
   DISALLOW_COPY_AND_ASSIGN(ProofSourceChromium);
 };