GitLab

We deprecate the old RegisterCameraHalClient method, renaming it to
RegisterCameraHalClientLegacy and add a new RegisterCameraHalClient that
takes in a result callback that would indicate whether we've
successfully registered CameraHalClient.

BUG=b:170075468
TEST= \
  1. Build and deploy simplechrome
  2. Verify pi-arc (eve) could still use the old method to register.
  3. Apply ag/13017293 and ag/13026196 and verify the client is
     identified as Android.

Change-Id: Ib3e9cf137acea50d3d39601d31ef8a2c34f3df46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526650Reviewed-by: Shik Chen <shik@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Wei Lee <wtlee@chromium.org>
Commit-Queue: Jasmine Chen <lnishan@google.com>
Cr-Commit-Position: refs/heads/master@{#828688}