Don't issue Stop() for spurious command line differences.

Don't issue Stop() for spurious command line differences.

The android driver was checking self._current_cmd_line against its
own _android_driver_cmd_line() even though ServerProcess.start() was
setting that value based on the normal cmd_line().

Doing so results in the appearance of different command lines which
causes a ServerProcess.stop() to be issued and tear everything down.

Example:
_android_driver_cmd_line() = ['ContentShell.apk', '--no-timeout',
'--encode-binary', '--enable-hardware-gpu', '--force-compositing-mode',
'--enable-accelerated-fixed-position', '--dump-render-tree', '-']

_cmd_line() = ['adb', '-s', u'04aa0e7cdd540dac', 'shell']

Now a single content_shell instance is responsible for running all
the tests!  Much faster :)

BUG=232044
TEST=content_shell tests use a single instance.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=152840

[Peter Beverloo, 2013-06-20 21:43:41]

lgtm, thanks!

[commit-bot: I haz the power, 2013-06-20 21:47:50]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dalecurtis@chromium.org/17502004/1

[commit-bot: I haz the power, 2013-06-21 00:18:02]

Retried try job too often on win_layout_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_layout...

[commit-bot: I haz the power, 2013-06-21 00:35:59]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dalecurtis@chromium.org/17502004/1

[commit-bot: I haz the power, 2013-06-21 01:13:19]

Change committed as 152840