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VideoDecodeAccelerators are supposed to work without GL support,
provided the make_context_current_cb_ callback is null. However the
Initialize() method of V4L2 accelerators checked for a valid EGL display
unconditionally. Move this check under the condition that
make_context_current_cb_ is not null, so that the V4L2 accelerators can
be used without an EGL display.

BUG=819542
TEST=Made sure VDA tests were still passing on eve, hana and kevin.

Change-Id: I632e85bad6871910c8a9114c6c34338c37262c08
Reviewed-on: https://chromium-review.googlesource.com/954767Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542982}