Add system log fallback when native logging is unavailable.
Add system log fallback when native logging is unavailable.

BUG=

Review URL: https://codereview.webrtc.org/1354803002

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#9989}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: ca14b2f065c95caa965c3041d11200aa7a34b29a

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