Track install speed on devices and fail device status step on low battery.

This is a less aggressive patch than the description below. The original was reverted for breaking the Android tests bot (https://codereview.chromium.org/16299003).

Removes check install step and moves it into the device status check. This will allow us to examine Android install speeds, which have recently caused timeout problems when installing large APK's. Unlike the original CL, low install speed only causes a warning (i.e. does not fail the step). The step fails if the battery of an online device is less than 5%.

BUG=230970, 224004, 242237
---------------------------------------------------
Original CL:
Move CheckInstall to device status and fail on low install speed and battery.

Removes the recently added CheckInstall step and moves the checking to the
device status check step. Recently, devices will install very slowly causing
tests to fail with device problems. We have also seen battery issues. The new
device status check step will fail if any devices install unreasonably slow
(i.e. < 800 KB/s) or have critically low battery level (i.e. < 5%).

BUG=230970, 224004, 242237
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=203587

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=204013

[cmp_google, 2013-06-01 00:00:02]

lgtm

[navabi, 2013-06-01 00:04:21]

Thanks Chase.
Note: This will also introduce the check install step to the downstream bots,
which currently do not check. This will also identify slow installs which may be
related to timeout install errors on release-tests (i.e.
https://code.google.com/p/chromium/issues/detail?id=242237)

[commit-bot: I haz the power, 2013-06-01 00:05:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/navabi@google.com/16110005/1

[cmp, 2013-06-01 00:12:45]

lgtm

[commit-bot: I haz the power, 2013-06-01 01:05:50]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/navabi@google.com/16110005/17001

[commit-bot: I haz the power, 2013-06-01 04:55:01]

Change committed as 203587

[navabi, 2013-06-03 18:55:35]

PTAL.

[cmp, 2013-06-03 18:58:46]

lgtm

[commit-bot: I haz the power, 2013-06-03 19:18:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/navabi@google.com/16110005/29001

[commit-bot: I haz the power, 2013-06-03 22:58:47]

Retried try job too often on win_rel for step(s) browser_tests,
chrome_frame_net_tests, chrome_frame_tests, chrome_frame_unittests,
content_browsertests, installer_util_unittests, mini_installer_test,
nacl_integration, sync_integration_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2013-06-04 17:47:01]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/navabi@google.com/16110005/29001

[commit-bot: I haz the power, 2013-06-04 19:19:50]

Change committed as 204013