The Camera1 and Camera2 API use different framerate range types. Camera1
uses int[2] and Camera2 uses Range<Integer>. Range<Integer> is
unfortunately only available on Lollipop and later, so this CL adds a
similar FramerateRange class in CaptureFormat.
The purpose with this CL is to have a common framerate range type that can
be reused from both Camera1 and Camera2 in helper functions such as
CameraEnumerationAndroid.getClosestSupportedFramerateRange().
BUG=webrtc:5519
R=sakal@webrtc.org
Review URL: https://codereview.webrtc.org/2010763003 .
Cr-Commit-Position: refs/heads/master@{#12942}
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