camera3_test: test request template metadata

The request template returned by the camera device must include a
necessary set of metadata keys, and their values must be set
correctly. The added test cases reference the CTS basic test for
CameraDevice APIs.
Reference:
cts/CameraDeviceTest.java: captureTemplateTestByCamera(),
checkRequestForTemplate(), testCameraDeviceCreateCaptureBuilder()

BUG=b/32689987
TEST='emerge-kevin arc-camera3-test'

Change-Id: I482f0b412d2cec1a23cb07d417f15a30feb5cbeb
Reviewed-on: https://chromium-review.googlesource.com/446316
Commit-Ready: Hung-yu Wu <hywu@chromium.org>
Tested-by: Hung-yu Wu <hywu@chromium.org>
Reviewed-by: Hung-yu Wu <hywu@chromium.org>
3 files changed