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Currently demuxer stream limits are 12MiB for audio and 150MiB for video,
regardless of the platform. This means that when playing long videos Chrome
will slowly allocate up to 162MiB. Most low-end Android devices can't afford
allocating that much, which translates to bad user experience: first device
becomes sluggish, as OS tries hard to kill other processes / move memory to
zram. Eventually (since renderer keeps allocating) Android gives up and kills
Chrome.

Turns out that Chromecast had similar issues and ended up lowering demuxer
limits to 2MiB for audio / 30MiB for video.

This CL turns demuxer limit constants into functions and selects lower
values on low-end Android devices.

Bug: 810906
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: I33fcd7d4916379abcb1f56cf9289928dfe3788a7
Reviewed-on: https://chromium-review.googlesource.com/922884Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dmitry Skiba <dskiba@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537853}