Add the PPAPI X509 Certificate interface and implementation.

content/browser/renderer_host/pepper_tcp_socket.h

Index: content/browser/renderer_host/pepper_tcp_socket.h
diff --git a/content/browser/renderer_host/pepper_tcp_socket.h b/content/browser/renderer_host/pepper_tcp_socket.h
index af1b6ed610db9766cbbdcae37be3832f2a3149df..abf7b5c3f97cc9d2488259b903ed7480c10c2614 100644
--- a/content/browser/renderer_host/pepper_tcp_socket.h
+++ b/content/browser/renderer_host/pepper_tcp_socket.h
@@ -15,6 +15,10 @@
 #include "net/base/completion_callback.h"
 #include "ppapi/c/pp_stdint.h"
 
+namespace ppapi {
+class PPB_X509Certificate_Fields;
+}
+
 class PepperMessageFilter;
 struct PP_NetAddress_Private;
 
@@ -22,6 +26,7 @@ namespace net {
 class IOBuffer;
 class SingleRequestHostResolver;
 class StreamSocket;
+class X509Certificate;
 }
 
 // PepperTCPSocket is used by PepperMessageFilter to handle requests from
@@ -52,6 +57,16 @@ class PepperTCPSocket {
 
   void SendConnectACKError();
 
+  // Extract the certificate field data from a |net::X509Certificate| into

[yzshen1, 2012/03/20 06:48:01]

- Would you please explain why we should put GetCertificateFields in
PepperTCPSocket?
- Please use third person singular for method comments. (and also line 64).

[raymes, 2012/03/21 20:28:08]

The certificates are related to the SSL socket functionality (e.g. the servers
certificate will be transmitted to the client upon an SSLHandshake). I guess the
link is a bit unclear here, because I haven't added the functionality which
allows you to get the servers certificate, or to add trusted/untrusted
certificates. That functionality is in a subsequent CL. The alternative is to
have these as free-standing functions in a separate file, but I think keeping
them here makes more sense for now.
Done.

+  // |PPB_X509Certificate_Fields|.
+  static bool GetCertificateFields(const net::X509Certificate& cert,
+                                   ppapi::PPB_X509Certificate_Fields* fields);
+  // Extract the certificate field data from the der representation of a
+  // certificate into |PPB_X509Certificate_Fields|.
+  static bool GetCertificateFields(const char* der,
+                                   uint32_t length,
+                                   ppapi::PPB_X509Certificate_Fields* fields);
+
  private:
   enum ConnectionState {
     // Before a connection is successfully established (including a previous