Add MediaKeySession.keystatuseschange event

public/platform/WebEncryptedMediaKeyInformation.h

Index: public/platform/WebEncryptedMediaKeyInformation.h
diff --git a/public/platform/WebEncryptedMediaKeyInformation.h b/public/platform/WebEncryptedMediaKeyInformation.h
new file mode 100644
index 0000000000000000000000000000000000000000..68a8dbf2054056e2c9ee3ebb90e0751e0343fed3
--- /dev/null
+++ b/public/platform/WebEncryptedMediaKeyInformation.h
@@ -0,0 +1,42 @@
+// Copyright 2015 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 WebEncryptedMediaKeyInformation_h
+#define WebEncryptedMediaKeyInformation_h
+
+#include "WebCommon.h"
+#include "WebVector.h"
+
+namespace blink {
+
+class BLINK_PLATFORM_EXPORT WebEncryptedMediaKeyInformation {
+public:
+    enum KeyStatus {
+        Usable,
+        Expired,
+        OutputNotAllowed,
+        InternalError
+    };
+
+    WebEncryptedMediaKeyInformation();
+    ~WebEncryptedMediaKeyInformation();
+
+    const WebVector<unsigned char>& id() const;
+    void setId(const unsigned char* id, size_t idLength);
+
+    KeyStatus status() const;
+    void setStatus(KeyStatus);
+
+    uint32_t systemCode() const;
+    void setSystemCode(uint32_t);
+
+private:
+    WebVector<unsigned char> m_id;
+    KeyStatus m_status;
+    uint32_t m_systemCode;
+};
+
+} // namespace blink
+
+#endif // WebEncryptedMediaKeyInformation_h