[CCA] Launch camera view in intent specified mode.

Bug: 980812
Test: Fire android.media.action.VIDEO_CAMERA and
    android.media.action.STILL_IMAGE_CAMERA, see if CCA is opened in
    correct mode.

Change-Id: I6b50fc673ecf77948107a1280f0ea25129c33777
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1757571
Commit-Queue: Kuo Jen Wei <inker@chromium.org>
Auto-Submit: Kuo Jen Wei <inker@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701886}