This enables logging API commands to Android logcat.  It is enabled
via the following GN arg:

    angle_enable_android_api_logcat = true

On desktop, API commands can continue to be logged to the
"angle_debug.txt" file via a different mechanism, with the GN arg:

    angle_enable_trace = true

Bug: b/170249632
Change-Id: Id52e75f966a97692ec6d69eb3d254ba295a151c2
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2519094
Commit-Queue: Ian Elliott <ianelliott@google.com>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Charlie Lao <cclao@google.com>