Add PPAPI decryptor interfaces.

ppapi/cpp/dev/content_decryptor_dev.h

Index: ppapi/cpp/dev/content_decryptor_dev.h
diff --git a/ppapi/cpp/dev/content_decryptor_dev.h b/ppapi/cpp/dev/content_decryptor_dev.h
new file mode 100644
index 0000000000000000000000000000000000000000..36cb949de2bed1d4068ef221bb12b00f28b5282d
--- /dev/null
+++ b/ppapi/cpp/dev/content_decryptor_dev.h
@@ -0,0 +1,42 @@
+// Copyright (c) 2012 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 PPAPI_CPP_DEV_CONTENT_DECRYPTOR_DEV_H_
+#define PPAPI_CPP_DEV_CONTENT_DECRYPTOR_DEV_H_
+
+#include "ppapi/c/dev/ppp_content_decryptor_dev.h"
+#include "ppapi/cpp/instance_handle.h"
+
+namespace pp {
+
+class Instance;
+
+class ContentDecryptor_Dev {
+ public:
+  explicit ContentDecryptor_Dev(Instance* instance);
+  virtual ~ContentDecryptor_Dev();
+
+  // PPP_ContentDecryptor_Dev functions exposed as virtual functions
+  // for you to override.
+  virtual bool GenerateKeyRequest(PP_Var key_system,
+                                  PP_Resource init_data) = 0;
+
+  virtual bool AddKey(PP_Var session_id,
+                      PP_Resource key) = 0;
+
+  virtual bool CancelKeyRequest(PP_Var session_id) = 0;
+
+  virtual bool Decrypt(PP_Resource encrypted_block,
+                       PP_CompletionCallback callback) = 0;
+
+  virtual bool DecryptAndDecode(PP_Resource encrypted_block,
+                                PP_CompletionCallback callback) = 0;
+
+ private:
+  InstanceHandle associated_instance_;
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_DEV_CONTENT_DECRYPTOR_DEV_H_