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Some DemuxerStream could hit non-recoverable fatal errors. For example,
DecryptingDemuxerStream cannot decrypt a buffer because the CDM was
crashed.

This CL adds a new kError status to DemuxerStream::Status to indicate
such conditions.

BUG=730766
TEST=New unittests added.

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: Ia07e14662d7da852f712076dcc94aed1900aaba3
Reviewed-on: https://chromium-review.googlesource.com/598702
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Matthew Wolenetz <wolenetz@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491960}