Call CDMWrapper from PpapiDecryptor.

ppapi/api/dev/pp_decryption_buffer_dev.idl

Index: ppapi/api/dev/pp_decryption_buffer_dev.idl
diff --git a/ppapi/api/dev/pp_decryption_buffer_dev.idl b/ppapi/api/dev/pp_decryption_buffer_dev.idl
new file mode 100644
index 0000000000000000000000000000000000000000..38bff3e64ad5dc8d79f3902b379bb1df059306f9
--- /dev/null
+++ b/ppapi/api/dev/pp_decryption_buffer_dev.idl
@@ -0,0 +1,59 @@
+/* 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.
+ */
+
+/**
+ * The data structure for decryption subsample entry.
+ */
+[assert_size(8)]
+struct PP_DecryptionSubsampleEntry_Dev {
+  uint32_t clear_bytes;
+  uint32_t cypher_bytes;
+};
+
+/**
+ * The data structure for decryption buffer.

[dmichael (off chromium), 2012/08/09 16:24:52]

This doesn't tell me any more than the class name does. Could you elaborate on
what the decryption buffer is? Same for the SubsampleEntry. Referencing what
this maps to in the spec might be a good way to go.

+ */
+[assert_size(348)]
+struct PP_DecryptionBuffer_Dev {

[xhwang, 2012/08/07 00:53:48]

dmichael@: this is what I talked about offline. It works, but not really sure if
this is the best approach. PTAL and let me know your opinion.

+  /**
+   * Buffer to hold the encrypted data. Should be allocated using the
+   * PPB_Buffer interface for consistent interprocess behaviour.
+   */
+  PP_Resource data;

[dmichael (off chromium), 2012/08/09 16:24:52]

I think everything else is okay, but I'd rather you separate out the data. We
don't really have a good way to embed a reference-counted type in a struct.

+
+  /**
+   * Size of data to be discarded before applying the decryption (in bytes).
+   */
+  uint32_t data_offset;
+
+  /**
+   * Client-specified identifier for the decryption buffer.
+   */
+  uint32_t id;
+
+  /**
+   * Key ID of the decryption buffer.
+   */
+  uint8_t[64] key_id;
+  uint32_t key_id_size;
+
+  /**
+   * Initialization vector of the decryption buffer.
+   */
+  uint8_t[64] iv;
+  uint32_t iv_size;
+
+  /**
+   * Checksum of the decryption buffer.
+   */
+  uint8_t[64] checksum;
+  uint32_t checksum_size;
+
+  /**
+   * Subsamples of the decryption buffer, as specified in Common Encryption.
+   */
+  PP_DecryptionSubsampleEntry_Dev[16] subsamples;
+  uint32_t num_subsamples;
+};