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This CL skips the wait for 3A-convergence (AE, AF, AWB) when
Zero-Shutter Lag (ZSL) is enabled. When configuring streams, camera HAL
adapter would add a private usage flag to the configured still capture
streams. Video Capture Device (VCD) would then use this private usage
flag to determine if ZSL is enabled. If ZSL is enabled, we skip 3A when
trying to construct a capture request.

This is a reland of crrev.com/c/1919530. In
Camera3AControllerTest.Stabilize3AForStillCaptureTest, we didn't
initialize zero_shutter_lag_enabled causing 3A stabilization to be
skipped randomly, failing postsubmit.

BUG=b:130851309
TEST=Tested on kukui and verified VCD is able to get ZSL availability
through the private usage flag && capture_unittests.

Change-Id: I8717dec6210151242240502ebd37c68c43c530ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066410
Auto-Submit: Jasmine Chen <lnishan@google.com>
Reviewed-by: Shik Chen <shik@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Jasmine Chen <lnishan@google.com>
Cr-Commit-Position: refs/heads/master@{#743471}