Add RunUnitTests() and RunUnitTestsInDirectory() canned checks.

Add RunUnitTests() and RunUnitTestsInDirectory() canned checks.

Deprecate RunPythonUnitTests() since it is a bit awkward.

Add os_listdir, os_walk and platform to InputApi.

GOAL=Slowly adds python 2.5 support for unit tests
BUG=none
TEST=new unit test
R=dpranke@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=80009

[Dirk Pranke, 2011-03-30 20:18:58]

http://codereview.chromium.org/6778027/diff/1/presubmit_canned_checks.py
File presubmit_canned_checks.py (right):

http://codereview.chromium.org/6778027/diff/1/presubmit_canned_checks.py#newc...
presubmit_canned_checks.py:444: sys.executable.
I read "it" here as Windows (or Python), but you mean "it" == this method. Can
you change "it will" to "we"?

http://codereview.chromium.org/6778027/diff/1/presubmit_canned_checks.py#newc...
presubmit_canned_checks.py:484: """
Can we make this just call RunUnitTests()? Do we need to duplicate the code?

[M-A Ruel, 2011-03-31 00:11:06]

http://codereview.chromium.org/6778027/diff/1/presubmit_canned_checks.py
File presubmit_canned_checks.py (right):

http://codereview.chromium.org/6778027/diff/1/presubmit_canned_checks.py#newc...
presubmit_canned_checks.py:484: """
On 2011/03/30 20:18:58, Dirk Pranke wrote:
> Can we make this just call RunUnitTests()? Do we need to duplicate the code?

The code is really different. And I'll simply remove all usage of this function
and will delete in a few weeks.

[Dirk Pranke, 2011-03-31 00:49:33]

Whoops, you're right. They are quite different.

LGTM.