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This CL continues implementing ImageCapture:

- adds |iso|, |imageHeight| and |imageWidth| to PhotoCapabilities
 (each is a MediaSettingsRange).
- adds |imageHeight| and |imageWidth| to PhotoSettings.
- extends image_capture.mojom to support all the previous new
 fields
- wires Android's "old" and "new" Camera API to provide the
 capabilities and listen to the Settings (seems like the
 "old" does not reliably support ISO).
- extends the FakeVideoCaptureDeviceTest and the LayoutTests
 for these new features.

Note that setOptions() is not synchronous with takePhoto(),
so VideoCaptureDeviceAndroid holds on to the latest, if any,
requested capture resolution.

BUG=518807

Review-Url: https://codereview.chromium.org/2164473002
Cr-Commit-Position: refs/heads/master@{#407298}