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..9acb7f24d1fae550100d9953ce1e6efb4ddeb73e
--- /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 "public/platform/WebData.h"
+
+namespace blink {
+
+class BLINK_PLATFORM_EXPORT WebEncryptedMediaKeyInformation {
+public:
+    enum class KeyStatus {
+        Usable,
+        Expired,
+        OutputNotAllowed,
+        InternalError
+    };
+
+    WebEncryptedMediaKeyInformation();
+    ~WebEncryptedMediaKeyInformation();
+
+    WebData id() const;

[dcheng, 2015/01/20 23:15:31]

I think it's OK to inline all this stuff.

+    void setId(const WebData&);
+
+    KeyStatus status() const;
+    void setStatus(KeyStatus);
+
+    uint32_t systemCode() const;
+    void setSystemCode(uint32_t);
+
+private:
+    WebData m_id;
+    KeyStatus m_status;
+    uint32_t m_systemCode;
+};
+
+} // namespace blink
+
+#endif // WebEncryptedMediaKeyInformation_h