Linux pairing registry delegate implementation

remoting/protocol/pairing_registry.h

Index: remoting/protocol/pairing_registry.h
diff --git a/remoting/protocol/pairing_registry.h b/remoting/protocol/pairing_registry.h
index 354452438a046f7d7b7d5a29415ceb370aa1a961..e9bec6f205d96077af92943e5fc9217d673f597e 100644
--- a/remoting/protocol/pairing_registry.h
+++ b/remoting/protocol/pairing_registry.h
@@ -14,6 +14,10 @@
 #include "base/threading/non_thread_safe.h"
 #include "base/time.h"
 
+namespace base {
+class TaskRunner;
+}  // namespace base
+
 namespace remoting {
 namespace protocol {
 
@@ -88,14 +92,20 @@ class PairingRegistry : public base::RefCountedThreadSafe<PairingRegistry>,
 
   explicit PairingRegistry(scoped_ptr<Delegate> delegate);
 
-  // Create a pairing for a new client and save it to disk.
+  // Creates a pairing for a new client and saves it to disk.
   Pairing CreatePairing(const std::string& client_name);
 
-  // Get the pairing for the specified client id. See the corresponding
+  // Gets the pairing for the specified client id. See the corresponding
   // Delegate method for details.
   void GetPairing(const std::string& client_id,
                   const GetPairingCallback& callback);
 
+  // Returns a platform-specific Delegate that will save to permanent storage
+  // using the specified TaskRunner. Returns NULL on platforms that don't
+  // support pairing.
+  static scoped_ptr<Delegate> CreateDelegate(
+      scoped_refptr<base::TaskRunner> task_runner);
+
  private:
   friend class base::RefCountedThreadSafe<PairingRegistry>;
 
@@ -106,18 +116,6 @@ class PairingRegistry : public base::RefCountedThreadSafe<PairingRegistry>,
   DISALLOW_COPY_AND_ASSIGN(PairingRegistry);
 };
 
-// Temporary delegate that just logs NOTIMPLEMENTED for Load/Save.
-// TODO(jamiewalch): Delete once Delegates are implemented for all platforms.
-class NotImplementedPairingRegistryDelegate : public PairingRegistry::Delegate {
- public:
-  virtual void AddPairing(
-      const PairingRegistry::Pairing& paired_clients,
-      const PairingRegistry::AddPairingCallback& callback) OVERRIDE;
-  virtual void GetPairing(
-      const std::string& client_id,
-      const PairingRegistry::GetPairingCallback& callback) OVERRIDE;
-};
-
 }  // namespace protocol
 }  // namespace remoting