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* add mojo interfaces for enabling debug recording and creating debug recording files.
* add debug recording session factory to toggle between media/audio/ and services/audio/ debug recording implementations.

Design doc: http://doc/123YGEhyyDqbO1440rwdg0T_4UPxNyZmJboczjFIZpMI#heading=h.xpzwbhip9is6

This CL depends on [1]. Switching to mojo implementation will be done in [2].

[1] https://crrev.com/c/875927
[2] https://crrev.com/c/921281

Bug: 788657
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Idbbfdb89c6ad4ff373ac25db83b5ed4ef6167b86
Reviewed-on: https://chromium-review.googlesource.com/810809Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Reviewed-by: Max Morin <maxmorin@chromium.org>
Commit-Queue: Marina Ciocea <marinaciocea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539134}