Jungshik Jang f424932cfb Implement interfaces for MHL scratchpad command
1. Add sendScratchpadCommand to IHdmiControlService interface,
which is used to send scratchpad command.

2. Add IHdmiMhlScratchpadCommandListener to handle incoming
MHL scratchpad command.

Bug: 17146522

Change-Id: I8e8e743dc08a18c80867be470997ce79d3292c15
2014-08-22 11:45:50 +09:00
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