wifi_sync: add ability to convert WifiCredential to onc properties

components/wifi_sync/wifi_credential.h

Index: components/wifi_sync/wifi_credential.h
diff --git a/components/wifi_sync/wifi_credential.h b/components/wifi_sync/wifi_credential.h
index 7c0342a6c7e142049e9d78854b1cf98d69cd26a9..0128964e7c1aa7f463f9dbeb9c465a78e3f9caae 100644
--- a/components/wifi_sync/wifi_credential.h
+++ b/components/wifi_sync/wifi_credential.h
@@ -11,8 +11,13 @@
 #include <string>
 #include <vector>
 
+#include "base/memory/scoped_ptr.h"
 #include "components/wifi_sync/wifi_security_class.h"
 
+namespace base {
+class DictionaryValue;
+}
+
 namespace wifi_sync {
 
 // A container to hold the information required to locate and connect
@@ -24,22 +29,35 @@ class WifiCredential final {  // final because the class is copyable
       WifiCredential,
       bool(*)(const WifiCredential&a, const WifiCredential& b)>;
 
-  // Constructs a credential with the given |ssid|, |security_class|,
-  // and |passphrase|. No assumptions are made about the input
-  // encoding of |ssid|. The passphrase must be valid UTF-8.
-  WifiCredential(const SsidBytes& ssid,
-                 WifiSecurityClass security_class,
-                 const std::string& passphrase);
   ~WifiCredential();
 
   const SsidBytes& ssid() const { return ssid_; }
   WifiSecurityClass security_class() const { return security_class_; }
   const std::string& passphrase() const { return passphrase_; }
 
+  // Returns a dictionary which represents this WifiCredential as ONC
+  // properties. The resulting dictionary can be used, e.g, to
+  // configure a new network using
+  // chromeos::NetworkConfigurationHandler::CreateConfiguration. Due
+  // to limitations in ONC, this operation fails if ssid() is not
+  // valid UTF-8. In case of failure, returns a scoped_ptr with value
+  // nullptr.
+  scoped_ptr<base::DictionaryValue> ToOncProperties() const;
+
   // Returns a string representation of the credential, for debugging
   // purposes. The string will not include the credential's passphrase.
   std::string ToString() const;
 
+  // Creates a WifiCredential with the given |ssid|, |security_class|,
+  // and |passphrase|. No assumptions are made about the input
+  // encoding of |ssid|. |passphrase|, however, must be valid
+  // UTF-8. Returns a scoped_ptr to the created WifiCredential. If the
+  // parameters are invalid, returns a scoped_ptr with value nullptr.
+  static scoped_ptr<WifiCredential> Create(
+      const SsidBytes& ssid,
+      WifiSecurityClass security_class,
+      const std::string& passphrase);
+
   // Returns true if credential |a| comes before credential |b|.
   static bool IsLessThan(const WifiCredential& a, const WifiCredential& b);
 
@@ -47,7 +65,18 @@ class WifiCredential final {  // final because the class is copyable
   // ordering function plumbed in.
   static CredentialSet MakeSet();
 
+  // Returns |ssid| as an SsidBytes instance. This convenience
+  // function simplifies some tests, which need to instantiate
+  // SsidBytes from string literals.
+  static SsidBytes MakeSsidBytesForTest(const std::string& ssid);
+
  private:
+  // Constructs a credential with the given |ssid|, |security_class|,
+  // and |passphrase|.
+  WifiCredential(const SsidBytes& ssid,
+                 WifiSecurityClass security_class,
+                 const std::string& passphrase);
+
   // The WiFi network's SSID.
   const SsidBytes ssid_;
   // The WiFi network's security class (e.g. WEP, PSK).