[Chromecast] Change DecryptContext::Decrypt back

chromecast/media/base/decrypt_context_impl.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 CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_IMPL_H_
 #define CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_IMPL_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chromecast/media/base/key_systems_common.h"
 #include "chromecast/public/media/decrypt_context.h"
 
 namespace chromecast {
 namespace media {
 
 // Base class of a decryption context: a decryption context gathers all the
 // information needed to decrypt frames with a given key id.
 // Each CDM should implement this and add fields needed to fully describe a
 // decryption context.
-//
 class DecryptContextImpl : public DecryptContext {
  public:
   explicit DecryptContextImpl(CastKeySystem key_system);
   ~DecryptContextImpl() override;
 
   // DecryptContext implementation:
   CastKeySystem GetKeySystem() override;
-  bool Decrypt(CastDecoderBuffer* buffer, uint8_t* output) override;
+  bool Decrypt(CastDecoderBuffer* buffer,
+               std::vector<uint8_t>* output) final;
+
+  // TODO(yucliu): replace DecryptContext::Decrypt with this one in next
+  // public api releasing.
+  // Decrypts the given buffer. Returns true/false for success/failure,
+  // and places the decrypted data in |output| if successful.
+  // Decrypted data in |output| has the same length as |buffer|.
+  virtual bool Decrypt(CastDecoderBuffer* buffer, uint8_t* output) = 0;
 
   // Returns whether the data can be decrypted into user memory.
   // If the key system doesn't support secure output or the app explicitly
   // requires non secure output, it should return true;
   // If the key system doesn't allow clear content to be decrypted into user
   // memory, it should return false.
   virtual bool CanDecryptToBuffer() const;
 
  private:
   CastKeySystem key_system_;
 
   DISALLOW_COPY_AND_ASSIGN(DecryptContextImpl);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_IMPL_H_