Fix demuxer_perftest file paths and adjust various perftests' iterations/units.

Fix demuxer_perftest file paths and adjust various perftests' iterations/units.

Several of the benchmarks took too long to run (esp. on android) and so iterations were reduced. Some had too large/small results numbers with 'runs/s', and were switched to 'ms' or 'runs/ms'.

BUG=310837
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=234791

[rileya (GONE FROM CHROMIUM), 2013-11-12 22:35:55]

Some of the tests generally ran slow (and some even timed out on Android), so I
reduced iterations here and there. I also adjusted units to not all be runs/s,
to make some of the numbers more pleasant/readable.

My z620 takes ~55 seconds to run the tests, my Nexus 7 takes ~65 seconds
(excluding AudioPlaybackBenchmark and DemuxerPerfTest, since they require
ffmpeg, and not counting the android test runner setup/teardown time). The Nexus
4 takes ~80 seconds.

[scherkus (not reviewing), 2013-11-12 22:44:14]

lgtm

[commit-bot: I haz the power, 2013-11-13 00:00:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rileya@chromium.org/70833002/30001

[commit-bot: I haz the power, 2013-11-13 09:45:13]

Change committed as 234791