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This CL simplifies the threading of class VideoCaptureCamera2.java
and by doing so resolves potential issues caused by concurrent
access to member variables and Android video API calls.

See https://bugs.chromium.org/p/chromium/issues/detail?id=857530 for
details on issues.

The simplified model is to (still) have the constructor and public API
calls happen on a native thread, and to use a single dedicated thread
owned by the class instance to post to, do work on, and call back into
the native code.

This CL is part of a series, see Design Doc at
https://docs.google.com/document/d/1h1kva4VR1gaV3HVXaSYZFY41icfaB58j-WnHmJdyqc8/edit?usp=sharing

Bug: 857530
Change-Id: I75ffcc4a14f2395d833d80f300acef7b456676e8
Reviewed-on: https://chromium-review.googlesource.com/1117857
Commit-Queue: Christian Fremerey <chfremer@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576155}