Implement Chromium side of MediaKeys.isTypeSupported().

content/public/common/eme_init_data_type.h

Index: content/public/common/eme_init_data_type.h
diff --git a/content/public/common/eme_init_data_type.h b/content/public/common/eme_init_data_type.h
new file mode 100644
index 0000000000000000000000000000000000000000..720bbfc9bc4bebdfeca4e2b0050616278d49cd58
--- /dev/null
+++ b/content/public/common/eme_init_data_type.h
@@ -0,0 +1,27 @@
+// Copyright 2014 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 CONTENT_PUBLIC_COMMON_EME_INIT_DATA_TYPE_H_
+#define CONTENT_PUBLIC_COMMON_EME_INIT_DATA_TYPE_H_
+
+namespace content {
+
+// Defines bitmask values that specify registered initialization data types used
+// in Encrypted Media Extensions (EME).
+// The mask values are stored in a SupportedInitDataTypes.
+enum EmeInitDataType {
+  EME_INIT_DATA_TYPE_NONE = 0,
+  EME_INIT_DATA_TYPE_CENC = 1 << 0,

[ddorwin, 2014/09/13 01:20:45]

We should probably not define CENC if proprietary codecs are not supported. That
avoids needing to comment on assumptions in various other places.

[sandersd (OOO until July 31), 2014/09/22 23:45:52]

Done.

+  EME_INIT_DATA_TYPE_WEBM = 1 << 1,
+  EME_INIT_DATA_TYPE_KEYIDS = 1 << 2,
+  EME_INIT_DATA_TYPE_ALL = (EME_INIT_DATA_TYPE_CENC |
+                            EME_INIT_DATA_TYPE_WEBM |
+                            EME_INIT_DATA_TYPE_KEYIDS),
+};
+
+typedef uint32 SupportedInitDataTypes;
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_EME_INIT_DATA_TYPE_H_