Add Promises for EME (Chromium side)

content/renderer/media/crypto/proxy_decryptor.h

Index: content/renderer/media/crypto/proxy_decryptor.h
diff --git a/content/renderer/media/crypto/proxy_decryptor.h b/content/renderer/media/crypto/proxy_decryptor.h
index 668d81f4be85237f604f384a98ffbefc7140a1b7..98bfbb1d2b84b2270064718f74e5a99b066d997e 100644
--- a/content/renderer/media/crypto/proxy_decryptor.h
+++ b/content/renderer/media/crypto/proxy_decryptor.h
@@ -5,15 +5,13 @@
 #ifndef CONTENT_RENDERER_MEDIA_CRYPTO_PROXY_DECRYPTOR_H_
 #define CONTENT_RENDERER_MEDIA_CRYPTO_PROXY_DECRYPTOR_H_
 
-#include <map>
-#include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/containers/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "base/synchronization/lock.h"
 #include "media/base/decryptor.h"
 #include "media/base/media_keys.h"
 
@@ -33,12 +31,6 @@ class RendererCdmManager;
 // A decryptor proxy that creates a real decryptor object on demand and
 // forwards decryptor calls to it.
 //
-// Now that the Pepper API calls use session ID to match responses with
-// requests, this class maintains a mapping between session ID and web session
-// ID. Callers of this class expect web session IDs in the responses.
-// Session IDs are internal unique references to the session. Web session IDs
-// are the CDM generated ID for the session, and are what are visible to users.
-//
 // TODO(xhwang): Currently we don't support run-time switching among decryptor
 // objects. Fix this when needed.
 // TODO(xhwang): The ProxyDecryptor is not a Decryptor. Find a better name!
@@ -89,31 +81,23 @@ class ProxyDecryptor {
   void CancelKeyRequest(const std::string& session_id);
 
  private:
-  // Session_id <-> web_session_id map.
-  typedef std::map<uint32, std::string> SessionIdMap;
-
   // Helper function to create MediaKeys to handle the given |key_system|.
   scoped_ptr<media::MediaKeys> CreateMediaKeys(const std::string& key_system,
                                                const GURL& security_origin);
 
   // Callbacks for firing session events.
-  void OnSessionCreated(uint32 session_id, const std::string& web_session_id);
-  void OnSessionMessage(uint32 session_id,
+  void OnSessionMessage(const std::string& web_session_id,
                         const std::vector<uint8>& message,
                         const GURL& default_url);
-  void OnSessionReady(uint32 session_id);
-  void OnSessionClosed(uint32 session_id);
-  void OnSessionError(uint32 session_id,
-                      media::MediaKeys::KeyError error_code,
-                      uint32 system_code);
-
-  // Helper function to determine session_id for the provided |web_session_id|.
-  uint32 LookupSessionId(const std::string& web_session_id) const;
+  void OnSessionReady(const std::string& web_session_id);
+  void OnSessionClosed(const std::string& web_session_id);
+  void OnSessionError(const std::string& web_session_id,
+                      media::MediaKeys::Exception exception_code,
+                      uint32 system_code,
+                      const std::string& error_message);
 
-  // Helper function to determine web_session_id for the provided |session_id|.
-  // The returned web_session_id is only valid on the main thread, and should be
-  // stored by copy.
-  const std::string& LookupWebSessionId(uint32 session_id) const;
+  // Called when a session is actually created or loaded.
+  void SetSessionId(bool persistent, const std::string& web_session_id);
 
 #if defined(ENABLE_PEPPER_CDMS)
   // Callback to create the Pepper plugin.
@@ -131,14 +115,8 @@ class ProxyDecryptor {
   KeyErrorCB key_error_cb_;
   KeyMessageCB key_message_cb_;
 
-  // Session IDs are used to uniquely track sessions so that CDM callbacks
-  // can get mapped to the correct session ID. Session ID should be unique
-  // per renderer process for debugging purposes.
-  static uint32 next_session_id_;
-
-  SessionIdMap sessions_;
-
-  std::set<uint32> persistent_sessions_;
+  // Keep track of both persistent and non-persistent sessions.
+  base::hash_map<std::string, bool> active_sessions_;
 
   bool is_clear_key_;