Support generation of EC keys using P256 curve and support ECDSA certs.

webrtc/base/opensslidentity.h

Index: webrtc/base/opensslidentity.h
diff --git a/webrtc/base/opensslidentity.h b/webrtc/base/opensslidentity.h
index ee7aabedd1080ddc01d436e91c6312c06cf1c9a6..4d63c4a9dbec55d4fad04179cfaf911178c824d0 100644
--- a/webrtc/base/opensslidentity.h
+++ b/webrtc/base/opensslidentity.h
@@ -32,7 +32,7 @@ class OpenSSLKeyPair {
     ASSERT(pkey_ != NULL);
   }
 
-  static OpenSSLKeyPair* Generate();
+  static OpenSSLKeyPair* Generate(KeyType key_type);
 
   virtual ~OpenSSLKeyPair();
 
@@ -99,8 +99,10 @@ class OpenSSLCertificate : public SSLCertificate {
 // them consistently.
 class OpenSSLIdentity : public SSLIdentity {
  public:
-  static OpenSSLIdentity* Generate(const std::string& common_name);
-  static OpenSSLIdentity* GenerateForTest(const SSLIdentityParams& params);
+  static OpenSSLIdentity* Generate(const std::string& common_name,
+                                   KeyType key_type);
+  static OpenSSLIdentity* GenerateForTest(const SSLIdentityParams& params,
+                                          KeyType key_type);
   static SSLIdentity* FromPEMStrings(const std::string& private_key,
                                      const std::string& certificate);
   ~OpenSSLIdentity() override;
@@ -114,7 +116,8 @@ class OpenSSLIdentity : public SSLIdentity {
  private:
   OpenSSLIdentity(OpenSSLKeyPair* key_pair, OpenSSLCertificate* certificate);
 
-  static OpenSSLIdentity* GenerateInternal(const SSLIdentityParams& params);
+  static OpenSSLIdentity* GenerateInternal(const SSLIdentityParams& params,
+                                           KeyType key_type);
 
   scoped_ptr<OpenSSLKeyPair> key_pair_;
   scoped_ptr<OpenSSLCertificate> certificate_;