Move ChromeOS memory collection function from perf.py to pyauto.py.

Move ChromeOS memory collection function from perf.py to pyauto.py.

Also changed the name of the function from _GetMemoryStats to
GetCrosMemoryStats.

This change allows autotests (that import pyauto) to invoke the memory
collection function using something like this:

mem_info_dict = self.pyauto.GetMemoryStatsChromeOS(20)

(except replace '20' with a suitable duration for the given test).

BUG=None
TEST=Verified that autotest graphics_WebGLPerformance can successfully
invoke GetCrosMemoryStats(), given the change to pyauto.py in this CL.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=134622

[dennis_jeffrey, 2012-04-30 22:19:42]

This CL moves a utility function from perf.py to pyauto.py, which enables
autotests (that import pyauto) to invoke it.  The only change made to the
function itself is the name.  Everything else remains the same in the moved
code.

[Nirnimesh, 2012-04-30 22:30:46]

LGTM

https://chromiumcodereview.appspot.com/10271023/diff/1/chrome/test/pyautolib/...
File chrome/test/pyautolib/pyauto.py (right):

https://chromiumcodereview.appspot.com/10271023/diff/1/chrome/test/pyautolib/...
chrome/test/pyautolib/pyauto.py:4930: def GetCrosMemoryStats(self, duration):
I recommend GetMemoryStatsonChromeOS
it's easier to search, and cros is kinda overloaded term

[dennis_jeffrey, 2012-04-30 22:37:43]

Thanks!

https://chromiumcodereview.appspot.com/10271023/diff/1/chrome/test/pyautolib/...
File chrome/test/pyautolib/pyauto.py (right):

https://chromiumcodereview.appspot.com/10271023/diff/1/chrome/test/pyautolib/...
chrome/test/pyautolib/pyauto.py:4930: def GetCrosMemoryStats(self, duration):
On 2012/04/30 22:30:46, Nirnimesh wrote:
> I recommend GetMemoryStatsonChromeOS
> it's easier to search, and cros is kinda overloaded term

Done - though I removed the "on" from the suggested name (figured it wasn't
really needed).