Update PluginInstance for audio support for content decryption.

webkit/media/crypto/ppapi/content_decryption_module.h

Index: webkit/media/crypto/ppapi/content_decryption_module.h
diff --git a/webkit/media/crypto/ppapi/content_decryption_module.h b/webkit/media/crypto/ppapi/content_decryption_module.h
index 4fd2ed97690bc6e62b8a73f166583837656c91a0..4893c44ec07eb1ee5c623b6e10de887cac723ae1 100644
--- a/webkit/media/crypto/ppapi/content_decryption_module.h
+++ b/webkit/media/crypto/ppapi/content_decryption_module.h
@@ -18,12 +18,8 @@ typedef __int64 int64_t;
 
 namespace cdm {
 class Allocator;
-class Buffer;
 class CdmHost;
 class ContentDecryptionModule;
-class DecryptedBlock;
-class KeyMessage;
-class VideoFrame;
 }
 
 extern "C" {
@@ -37,6 +33,12 @@ CDM_EXPORT const char* GetCdmVersion();
 
 namespace cdm {
 
+class AudioFrames;
+class Buffer;
+class DecryptedBlock;
+class KeyMessage;
+class VideoFrame;
+
 enum Status {
   kSuccess = 0,
   kNeedMoreData,  // Decoder needs more data to produce a decoded frame/sample.
@@ -316,20 +318,8 @@ class ContentDecryptionModule {
   // Returns kDecodeError if any decoding error happened.
   // If the return value is not kSuccess, |sample_buffer| should be ignored by
   // the caller.
-  //
-  // |audio_frames| can contain multiple audio output buffers. Each buffer must
-  // be serialized in this format:
-  //
-  // |<------------------- serialized audio buffer ------------------->|
-  // | int64_t timestamp | int64_t length | length bytes of audio data |
-  //
-  // For example, with three audio output buffers, |audio_frames| will look
-  // like this:
-  //
-  // |<---------------- audio_frames ------------------>|
-  // | audio buffer 0 | audio buffer 1 | audio buffer 2 |
   virtual Status DecryptAndDecodeSamples(const InputBuffer& encrypted_buffer,
-                                         Buffer* audio_frames) = 0;
+                                         AudioFrames* audio_frames) = 0;
 
   virtual ~ContentDecryptionModule() {}
 };
@@ -445,6 +435,27 @@ class VideoFrame {
    virtual ~VideoFrame() {}
 };
 
+// Represents decrypted and decoded audio frames. AudioFrames can contain
+// multiple audio output buffers, which are serialized into this format:
+//
+// |<------------------- serialized audio buffer ------------------->|
+// | int64_t timestamp | int64_t length | length bytes of audio data |
+//
+// For example, with three audio output buffers, the AudioFrames will look
+// like this:
+//
+// |<----------------- AudioFrames ------------------>|
+// | audio buffer 0 | audio buffer 1 | audio buffer 2 |
+class AudioFrames {
+ public:
+  virtual void set_buffer(Buffer* buffer) = 0;
+  virtual Buffer* buffer() = 0;
+
+ protected:
+  AudioFrames() {}
+  virtual ~AudioFrames() {}
+};
+
 }  // namespace cdm
 
 #endif  // WEBKIT_MEDIA_CRYPTO_PPAPI_CONTENT_DECRYPTION_MODULE_H_