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Update code in media to use JavaRef when calling Java methods via JNI,
instead of passing bar jobject. Various function parameter types are
converted from jobject to JavaRef to enable calls to obj() higher up the
call chain to be removed.

BUG=506850

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: I3ea85d7934655549e1f04feaf885f249cb9019c4
Reviewed-on: https://chromium-review.googlesource.com/585627Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490799}