Enumerating camera capabilities in the deprecated android.hardware.Camera interface is really slow because of the need to open and release the camera. By making getSupportedFormats() an interface, we allow apps the opportunity to inject their own implementation, such as storing the supported formats offline in the device's internal storage. It will also be possible to add an implementation of getSupportedFormats() using the new android.hardware.Camera2 interface in a follow-up CL.
R=tommi@webrtc.org
Review URL: https://codereview.webrtc.org/1321903002 .
Cr-Commit-Position: refs/heads/master@{#9819}
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