Add video decoding methods in Decryptor and add DecryptingVideoDecoder.

webkit/media/crypto/proxy_decryptor.h

Index: webkit/media/crypto/proxy_decryptor.h
diff --git a/webkit/media/crypto/proxy_decryptor.h b/webkit/media/crypto/proxy_decryptor.h
index 0725fdd37a7764173736369fc70fd36b17bfff46..175aef67fdac1d4e62187d0a38d59064534949ee 100644
--- a/webkit/media/crypto/proxy_decryptor.h
+++ b/webkit/media/crypto/proxy_decryptor.h
@@ -57,6 +57,13 @@ class ProxyDecryptor : public media::Decryptor {
   virtual void Decrypt(const scoped_refptr<media::DecoderBuffer>& encrypted,
                        const DecryptCB& decrypt_cb) OVERRIDE;
   virtual void CancelDecrypt() 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:
   // Helper functions to create decryptors to handle the given |key_system|.