VR: Split off UI code into a library to ease future unit testing.

VR: Split off UI code into a library to ease future unit testing.

This new library contains most "utility" and UI code, which is platform
independent and easily testable.  The original library contains core,
Android, threading, etc.  This is a step towards being able to build a
small unit test binary, and run it on Linux.

To allow the split, add a GL renderer interface to hide the GL thread
from UI elements.

BUG=727396
Review-Url: https://codereview.chromium.org/2903363002
Cr-Original-Commit-Position: refs/heads/master@{#475516}
Review-Url: https://codereview.chromium.org/2923043003 .
Cr-Commit-Position: refs/branch-heads/3112@{#191}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed: https://chromium.googlesource.com/chromium/src/+/193ebc46e5070c5bc855234f8a02d90c8903b69b

[cjgrant, 2017-06-06 18:10:50]

Description was changed from

==========
VR: Split off UI code into a library to ease future unit testing.

This new library contains most "utility" and UI code, which is platform
independent and easily testable.  The original library contains core,
Android, threading, etc.  This is a step towards being able to build a
small unit test binary, and run it on Linux.

To allow the split, add a GL renderer interface to hide the GL thread
from UI elements.

BUG=727396

Review-Url: https://codereview.chromium.org/2903363002
Cr-Commit-Position: refs/heads/master@{#475516}
(cherry picked from commit 18addc1ee2e63344ce882005e48c2e509a7402b5)
==========

to

==========
VR: Split off UI code into a library to ease future unit testing.

This new library contains most "utility" and UI code, which is platform
independent and easily testable.  The original library contains core,
Android, threading, etc.  This is a step towards being able to build a
small unit test binary, and run it on Linux.

To allow the split, add a GL renderer interface to hide the GL thread
from UI elements.

BUG=727396

Review-Url: https://codereview.chromium.org/2903363002
Cr-Original-Commit-Position: refs/heads/master@{#475516}
Review-Url: https://codereview.chromium.org/2923043003 .
Cr-Commit-Position: refs/branch-heads/3112@{#191}
Cr-Branched-From:
b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed:
https://chromium.googlesource.com/chromium/src/+/193ebc46e5070c5bc855234f8a02...
==========

[cjgrant, 2017-06-06 18:10:51]

Committed patchset #1 (id:1) manually as
193ebc46e5070c5bc855234f8a02d90c8903b69b.