Library Name: CameraX Extension stub and sample
License: Apache 2
Description: The CameraX Extension stub library along with a very basic sample
implementation. The stub includes extension API versions 1.2.0, 1.1.0 and older.

Local patches
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- No changes to the stubs
- Minor modifications to the sample implementation switching effects to white balance modes
- The HDR preview processor doesn't use GL to render to the registered output surface instead
  it will just attach the incoming image