Alter hooks to call into depot_tools lib....

Alter hooks to call into depot_tools lib.

This new method allows us to install pre-cl-upload
and pre-cl-dcommit hook files which should rarely need
to be updated (with luck).  These hooks load the real
hooks lib from depot_tools which takes over execution
of the presubmit tests.

BUG=5339
TEST=hooks are run by git cl upload/dcommit and behave
as expected

[Evan Martin, 2009-10-07 00:09:11]

ok

http://codereview.chromium.org/243118/diff/1/3
File git-cl-upload-hook (right):

http://codereview.chromium.org/243118/diff/1/3#newcode24
Line 24: # Get arguments from how we were called.
Is this comment still descriptive?

[chase, 2009-10-07 00:12:04]

http://codereview.chromium.org/243118/diff/1/3
File git-cl-upload-hook (right):

http://codereview.chromium.org/243118/diff/1/3#newcode24
Line 24: # Get arguments from how we were called.
On 2009/10/07 00:09:11, Evan Martin wrote:
> Is this comment still descriptive?

Thanks for catching.  Done.

[M-A Ruel, 2009-10-07 00:12:42]

lgtm

http://codereview.chromium.org/243118/diff/1/3
File git-cl-upload-hook (right):

http://codereview.chromium.org/243118/diff/1/3#newcode21
Line 21: if len(sys.argv) < 2:
!= ?

[chase, 2009-10-07 00:15:16]

http://codereview.chromium.org/243118/diff/1/3
File git-cl-upload-hook (right):

http://codereview.chromium.org/243118/diff/1/3#newcode21
Line 21: if len(sys.argv) < 2:
On 2009/10/07 00:12:42, Marc-Antoine Ruel wrote:
> != ?

Done.