Add video decoding methods in Decryptor and add DecryptingVideoDecoder.

webkit/media/crypto/ppapi_decryptor.h

Index: webkit/media/crypto/ppapi_decryptor.h
diff --git a/webkit/media/crypto/ppapi_decryptor.h b/webkit/media/crypto/ppapi_decryptor.h
index 33264816c8f8fc3015ef5f75389ab94c08af1613..34c1bfc72c7da391299e073af90978eb673811c6 100644
--- a/webkit/media/crypto/ppapi_decryptor.h
+++ b/webkit/media/crypto/ppapi_decryptor.h
@@ -51,6 +51,13 @@ class PpapiDecryptor : public media::Decryptor {
   virtual void Decrypt(const scoped_refptr<media::DecoderBuffer>& encrypted,
                        const DecryptCB& decrypt_cb) OVERRIDE;
   virtual void Stop() OVERRIDE;
+  virtual void InitializeVideoDecoder(const media::VideoDecoderConfig& config,
+                                      const DecoderInitCB& init_cb) OVERRIDE;
+  virtual void DecryptAndDecodeVideo(
+      const scoped_refptr<media::DecoderBuffer>& encrypted,
+      const VideoDecodeCB& video_decode_cb) OVERRIDE;
+  virtual void CancelDecryptAndDecodeVideo() OVERRIDE;
+  virtual void StopVideoDecoder() OVERRIDE;
 
  private:
   void ReportFailureToCallPlugin(const std::string& key_system,