Add a simple script for building a ctags DB

Add a simple script for building a ctags DB in a Chromium checkout.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=227679

[jln (very slow on Chromium), 2013-10-07 23:56:26]

Thanks for doing this!

I'm not a good reviewer for bash, but I'm not sure that anyone is if Markus is
not around.

lgtm with nits

https://codereview.chromium.org/26314003/diff/1/build/build-ctags.sh
File build/build-ctags.sh (right):

https://codereview.chromium.org/26314003/diff/1/build/build-ctags.sh#newcode7
build/build-ctags.sh:7: if [[ a"`ctags --version | head -1 | grep \"^Exuberant
Ctags\"`" == "a" ]]; then
This is a bash form for test, but you're executing /bin/sh. This may not work
with dash.

I would recommend /bin/bash at the sheebang.

https://codereview.chromium.org/26314003/diff/1/build/build-ctags.sh#newcode16
build/build-ctags.sh:16: CHROME_SRC_DIR="`pwd`"
$PWD?

[jww, 2013-10-08 20:19:23]

https://codereview.chromium.org/26314003/diff/1/build/build-ctags.sh
File build/build-ctags.sh (right):

https://codereview.chromium.org/26314003/diff/1/build/build-ctags.sh#newcode7
build/build-ctags.sh:7: if [[ a"`ctags --version | head -1 | grep \"^Exuberant
Ctags\"`" == "a" ]]; then
On 2013/10/07 23:56:26, jln wrote:
> This is a bash form for test, but you're executing /bin/sh. This may not work
> with dash.
> 
> I would recommend /bin/bash at the sheebang.

Done.

https://codereview.chromium.org/26314003/diff/1/build/build-ctags.sh#newcode16
build/build-ctags.sh:16: CHROME_SRC_DIR="`pwd`"
On 2013/10/07 23:56:26, jln wrote:
> $PWD?

Done.

[commit-bot: I haz the power, 2013-10-08 20:21:48]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jww@chromium.org/26314003/7001

[commit-bot: I haz the power, 2013-10-08 20:30:19]

Step "update" is always a major failure.
Look at the try server FAQ for more details.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=android_cl...

[commit-bot: I haz the power, 2013-10-08 20:35:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jww@chromium.org/26314003/7001

[commit-bot: I haz the power, 2013-10-09 02:23:27]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jww@chromium.org/26314003/7001

[commit-bot: I haz the power, 2013-10-09 05:40:43]

Change committed as 227679