This should only be enabled for testing for security reasons. Also, I'm not sure that all supported versions of Android have this support.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9d5f354616dea455ea08345c96b67081275a865d

commit 9d5f354616dea455ea08345c96b67081275a865d
Author: xhwang <xhwang@chromium.org>
Date: Sat May 13 03:57:41 2017

media: Add mojo_media_config to media/gpu configs

Otherwise, macros like ENABLE_MOJO_MEDIA_IN_GPU_PROCESS are not defined.
We should switch to use BUILDFLAG to prevent this from happening, that
is tracked by  issue 596252 .

BUG= 596252 ,721935
TEST=Manually tested encrypted playback.
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

Review-Url: https://codereview.chromium.org/2876123004
Cr-Commit-Position: refs/heads/master@{#471553}

[modify] https://crrev.com/9d5f354616dea455ea08345c96b67081275a865d/media/gpu/BUILD.gn

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

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This is actually becoming more and more important given the difficulty in testing Widevine directly.