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..72de6c0e7071d1b5bb11a7b0e6aa516ade36c159 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();
 
@@ -99,7 +99,8 @@ class OpenSSLCertificate : public SSLCertificate {
 // them consistently.
 class OpenSSLIdentity : public SSLIdentity {
  public:
-  static OpenSSLIdentity* Generate(const std::string& common_name);
+  static OpenSSLIdentity* Generate(const std::string& common_name,
+                                   KeyType key_type);
   static OpenSSLIdentity* GenerateForTest(const SSLIdentityParams& params);
   static SSLIdentity* FromPEMStrings(const std::string& private_key,
                                      const std::string& certificate);