Add cdbs to install-build-deps

Add cdbs to install-build-deps

The Common Debian Build System (cdbs) is needed for
packaging .deb files in some configurations.

http://packages.ubuntu.com/search?keywords=cdbs
shows that it's available for all common Ubuntu
distributions.
On Precise and Trusty, the package is very small (~40kB),
so it shouldn't have much impact on users.

TESTED=ran install-build-deps.sh on Ubuntu Precise.
R=friedman@chromium.org

Committed: https://chromium.googlesource.com/chromium/src/+/011f9c8ea361aab4ab654563ee53b650231630c3

[kjellander_chromium, 2014-09-01 08:16:32]

kjellander@chromium.org changed reviewers:
+ tommi@chromium.org

[kjellander_chromium, 2014-09-02 20:04:12]

kjellander@chromium.org changed reviewers:
+ friedman@chromium.org

[kjellander_chromium, 2014-09-02 20:04:12]

friedman@: Can you provide us with guidance here. Is there any more
information/motivation we need to provide in order add to install-build-deps.sh?
(I've never done it before).

[friedman, 2014-09-17 22:39:18]

On 2014/09/02 20:04:12, kjellander wrote:
> friedman@: Can you provide us with guidance here. Is there any more
> information/motivation we need to provide in order add to
install-build-deps.sh?
> (I've never done it before).

This script doesnt get run regularly on all hosts, but its good that this is
there because it will get run on newly installed hosts as part of turnup.  If
you need this package on machines you might want to file a bug to ensure theyre
all correct.

[kjellander_chromium, 2014-09-18 03:47:48]

On 2014/09/17 22:39:18, friedman wrote:
> On 2014/09/02 20:04:12, kjellander wrote:
> > friedman@: Can you provide us with guidance here. Is there any more
> > information/motivation we need to provide in order add to
> install-build-deps.sh?
> > (I've never done it before).
> 
> This script doesnt get run regularly on all hosts, but its good that this is
> there because it will get run on newly installed hosts as part of turnup.  If
> you need this package on machines you might want to file a bug to ensure
theyre
> all correct.

Yes, that was my understanding as well. I'm just trying to be pro-active here to
avoid errors on future builders.
I have already installed it on the machines that currently need it.
So can you approve this change?

[friedman, 2014-09-18 07:14:20]

lgtm

[commit-bot: I haz the power, 2014-09-19 07:29:45]

Patchset 2 (id:??) landed as
https://crrev.com/011f9c8ea361aab4ab654563ee53b650231630c3
Cr-Commit-Position: refs/heads/master@{#295674}

[kjellander_chromium, 2014-09-19 07:29:49]

Committed patchset #2 (id:20001) manually as 011f9c8 (presubmit successful).