hbos 6b470a9413 RTCCertificate serialization.
This CL adds the ability to convert RTCCertificate objects to and from
PEM string representations of it (its private key and certificate).
The RTCCertificate being a wrapper of SSLIdentity, this is where the
meat is.

Changes:
- SSLIdentity::PrivateKeyToPEMString() added. It together with the
  already existing SSLCertificate::ToPEMString() yields both private
  key and certificate PEM strings, both of which are required
  parameters to SSLIdentity::FromPEMStrings().
- Its only implementation, OpenSSLIdentity::PrivateKeyToPemString().
- SSLIdentity::PublicKeyToPEMString() added, used by tests.
- sslidentity_unittest.cc updated:
  * FromPEMStringsRSA and FromPEMStringsEC updated.
  * CloneIdentityRSA and CloneIdentityECDSA added.
- RTCCertificate::To/FromPem added, using new class RTCCertificatePem.
- rtccertificate_unittest.cc: New test CloneWithPemSerialization.
- Renamed rtc_unittests.cc to rtccertificate_unittest.cc to match
  convention.

BUG=webrtc:5794, chromium:581354

Review-Url: https://codereview.webrtc.org/1898383003
Cr-Commit-Position: refs/heads/master@{#12546}
2016-04-28 12:14:30 +00:00
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