Add MediaKeySession.keystatuseschange event

public/platform/WebContentDecryptionModuleSession.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebContentDecryptionModuleSession_h
 #define WebContentDecryptionModuleSession_h
 
 #include "WebCommon.h"
+#include "WebVector.h"
 #include "public/platform/WebContentDecryptionModuleException.h"
 #include "public/platform/WebContentDecryptionModuleResult.h"
 
 namespace blink {
 
+class WebEncryptedMediaKeyInformation;
 class WebString;
 class WebURL;
 
 class BLINK_PLATFORM_EXPORT WebContentDecryptionModuleSession {
 public:
     class BLINK_PLATFORM_EXPORT Client {
     public:
         enum class MessageType {
             LicenseRequest,
             LicenseRenewal,
             LicenseRelease
         };
 
         virtual void message(MessageType, const unsigned char* message, size_t messageLength) = 0;
         // FIXME: Remove this method once Chromium updated to call the method above.
         virtual void message(const unsigned char* message, size_t messageLength, const WebURL& destinationURL) = 0;
         virtual void close() = 0;
 
         // Called when the expiration time for the session changes.
         // |updatedExpiryTimeInMS| is specified as the number of milliseconds
         // since 01 January, 1970 UTC.
         virtual void expirationChanged(double updatedExpiryTimeInMS) = 0;
 
+        // Called when the set of keys for this session changes or existing keys
+        // change state. |hasAdditionalUsableKey| is set if a key is newly
+        // usable (e.g. new key available, previously expired key has been
+        // renewed, etc.) and the browser should attempt to resume playback
+        // if necessary.
+        virtual void keysStatusesChange(bool hasAdditionalUsableKey, const WebVector<WebEncryptedMediaKeyInformation>&) = 0;
+
     protected:
         virtual ~Client();
     };
 
     virtual ~WebContentDecryptionModuleSession();
 
     virtual void setClientInterface(Client*) = 0;
     virtual WebString sessionId() const = 0;
 
     virtual void initializeNewSession(const WebString& initDataType, const unsigned char* initData, size_t initDataLength, const WebString& sessionType, WebContentDecryptionModuleResult) = 0;
     virtual void load(const WebString& sessionId, WebContentDecryptionModuleResult) = 0;
     virtual void update(const unsigned char* response, size_t responseLength, WebContentDecryptionModuleResult) = 0;
     virtual void close(WebContentDecryptionModuleResult) = 0;
     virtual void remove(WebContentDecryptionModuleResult) = 0;
 };
 
 } // namespace blink
 
 #endif // WebContentDecryptionModuleSession_h