cr: Print a list of closest matching targets when no match is found

cr: Print a list of closest matching targets when no match is found

When the user passes in an invalid target name, print a list of closest
matches as a hint:

    $ cr build chromium_test_shell
    Invalid target chromium_test_shell as chromium_test_shell
    Did you mean chromium_testshell, libchromiumtestshell or chromium_testshell_paks?

NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=244507

[bulach, 2014-01-13 15:17:39]

lgtm, nice one, specially the chromium test shell and its infamous underscores
:) loved the example!

please wait for ian..

[ian_cottrell, 2014-01-13 15:38:05]

On 2014/01/13 15:17:39, bulach wrote:
> lgtm, nice one, specially the chromium test shell and its infamous underscores
> :) loved the example!
> 
> please wait for ian..

lgtm

I have a longer term plan for a more general version of this, that can apply to
more than just target matching. It should add support for accepting non
ambiguous pure matches, supporting tab completion, and possibly allowing for
selection prompts when there are few near matches, but this is a great first
step.

[commit-bot: I haz the power, 2014-01-13 15:44:50]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/skyostil@chromium.org/136553002/1

[commit-bot: I haz the power, 2014-01-13 15:45:04]

Change committed as 244507