media: Handle promise resolve/rejection in CdmPromiseAdapter.

media/base/cdm_promise_adapter.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_CDM_PROMISE_ADAPTER_H_
 #define MEDIA_BASE_CDM_PROMISE_ADAPTER_H_
 
 #include "base/basictypes.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/cdm_promise.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 // Helps convert CdmPromises to an integer identifier and vice versa. The
 // integer identifier is needed where we cannot pass CdmPromises through, such
 // as PPAPI, IPC and JNI.
 class MEDIA_EXPORT CdmPromiseAdapter {
  public:
   CdmPromiseAdapter();
   ~CdmPromiseAdapter();
 
   // Takes ownership of |promise| and returns an integer promise ID.
   uint32_t SavePromise(scoped_ptr<media::CdmPromise> promise);
 
-  // Finds, takes the ownership of and returns the promise for |promise_id|.
-  // Returns null if no promise can be found.
-  scoped_ptr<CdmPromise> TakePromise(uint32_t promise_id);
+  // Takes the promise for |promise_id|, sanity checks its |type|, and resolves
+  // it with |result|.
+  template <typename... T>
+  void ResolvePromise(uint32_t promise_id, const T&... result);
+
+  // Takes the promise for |promise_id| and rejects it with |exception_code|,
+  // |system_code| and |error_message|.
+  void RejectPromise(uint32_t promise_id,
+                     MediaKeys::Exception exception_code,
+                     uint32 system_code,
+                     const std::string& error_message);
 
   // Rejects and clears all |promises_|.
   void Clear();
 
  private:
   // A map between promise IDs and CdmPromises. It owns the CdmPromises.
   typedef base::ScopedPtrHashMap<uint32_t, CdmPromise> PromiseMap;
 
+  // Finds, takes the ownership of and returns the promise for |promise_id|.
+  // Returns null if no promise can be found.
+  scoped_ptr<CdmPromise> TakePromise(uint32_t promise_id);
+
   uint32_t next_promise_id_;
   PromiseMap promises_;
 
   DISALLOW_COPY_AND_ASSIGN(CdmPromiseAdapter);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_CDM_PROMISE_ADAPTER_H_