Add PPAPI decryptor interfaces.

ppapi/api/dev/ppp_content_decryption_module_dev.idl

+/* 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.
+ */
+
+/**
+ * This file defines the <code>PPP_ContentDecryptionModule_Dev</code>
+ * interface.
+ */
+label Chrome {
+  M22 = 0.1
+};
+
+/**
+ * <code>PPP_ContentDecryptionModule_Dev</code> structure contains the function
+ * pointers the decryption plugin MUST implement to provide services needed by
+ * the media stack.
+ */
+interface PPP_ContentDecryptionModule_Dev {
+  /**
+   * Provides a key or license to use for decryption. The key determines
+   * which methods are allowed by the plugin.
+   */
+  PP_Bool AddKey(
+      [in] PP_Instance instance,
+      [in] PP_Resource key);

[ddorwin, 2012/06/07 18:51:26]

need session_id. (initData is also missing but will probably be dropped so, we
can leave that off.)

[Tom Finegan, 2012/06/08 02:41:49]

Done/added in new patchset.

+
+  /**
+   * Decrypts the block and returns the unencrypted block.
+   * In the case of media, the block contains encoded data.
+   * decrypted_block is valid only after the callback is notified of success.
+   */
+  PP_Bool Decrypt(
+      [in] PP_Instance instance,
+      [in] PP_Resource encrypted_block,

[ddorwin, 2012/06/07 18:51:26]

Do other APIs provide comments as to what type of resource a parameter is? For
example, in this case, it's expected to be a PPB_Buffer_Dev.

+      [in] PP_Resource decrypted_block,
+      [in] PP_CompletionCallback callback);
+
+  /**
+   * Decrypts the block then decodes it and returns the raw (decoded)
+   * unencrypted frame.
+   * decoded_frame is valid only after the callback is notified of success.
+   */
+  PP_Bool DecryptAndDecode(
+      [in] PP_Instance instance,
+      [in] PP_Resource encrypted_block,
+      [in] PP_Resource decoded_frame,
+      [in] PP_CompletionCallback callback);
+};