ExtServices module - Displayhash
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### DisplayHashingService
DisplayHashingService is used to generate an instance of DisplayHash for the specified buffer.
It's also used to verify that a specific display hash was generated by the system. When generating
a display hash, the caller can specify which of the supported hashing algorithms it wishes to use.

### Test
- MTS
- CTS
  - cts-tradefed run cts -m CtsWindowManagerDeviceTestCases -t DisplayHashManagerTest