Support different Google attestation (Privacy CA) servers.

chrome/browser/chromeos/attestation/attestation_ca_client.h

Index: chrome/browser/chromeos/attestation/attestation_ca_client.h
diff --git a/chrome/browser/chromeos/attestation/attestation_ca_client.h b/chrome/browser/chromeos/attestation/attestation_ca_client.h
index c362ebc7af9e16972bc555bdff0caad9d34318cb..bd20390db487628a30e0726f023c243f6c8fb418 100644
--- a/chrome/browser/chromeos/attestation/attestation_ca_client.h
+++ b/chrome/browser/chromeos/attestation/attestation_ca_client.h
@@ -9,6 +9,7 @@
 #include <string>
 
 #include "base/macros.h"
+#include "chromeos/attestation/attestation_constants.h"
 #include "chromeos/attestation/attestation_flow.h"
 #include "net/url_request/url_fetcher_delegate.h"
 
@@ -32,7 +33,11 @@ class AttestationCAClient : public ServerProxy,
   // net::URLFetcherDelegate:
   void OnURLFetchComplete(const net::URLFetcher* source) override;
 
+  PrivacyCAType GetType() override;
+
  private:
+  PrivacyCAType pca_type_;
+
   typedef std::map<const net::URLFetcher*, DataCallback> FetcherCallbackMap;
 
   // POSTs |request| data to |url| and calls |on_response| with the response