Add video decoding methods in Decryptor and add DecryptingVideoDecoder.

media/base/decryptor.cc

Index: media/base/decryptor.cc
diff --git a/media/base/android/cookie_getter.cc b/media/base/decryptor.cc
similarity index 70%
copy from media/base/android/cookie_getter.cc
copy to media/base/decryptor.cc
index 1db105a6e2761584aaae4efb10b2734add95be05..e9b232ded713e80722667536177f6929066c1fe4 100644
--- a/media/base/android/cookie_getter.cc
+++ b/media/base/decryptor.cc
@@ -2,10 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "media/base/android/cookie_getter.h"
+#include "media/base/decryptor.h"
 
 namespace media {
 
-CookieGetter::~CookieGetter() {}
+Decryptor::Decryptor() {}
+
+Decryptor::~Decryptor() {}
 
 }  // namespace media