Enhancement for gdb_content_shell, allow set package_name and shared_lib_dir

Enhancement for gdb_content_shell, allow package_name and shared_lib_dir to be 
set from arguments. This enables debug other pieces such as base_unittests_apk

For example, to debug native tests, run with:
 gdb_apk -p org.chromium.native_test -l $CHROME_SRC/out/Release/lib.target -r


BUG=
TEST=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=146299

[Shouqun Liu, 2012-07-11 08:34:50]

Hi jrg, this patch enhances gdb_content_shell, make it can debug other apks
(*_unittests_apk) with 'package_name' and 'share_lib_dir' options. Thanks for
review

[John Grabowski, 2012-07-11 17:57:20]

LGTM!

Can you keep the old shell script name, but just have it redirect to the new
name?  Historical use will frustrate people.

[Shouqun Liu, 2012-07-12 02:43:43]

On 2012/07/11 17:57:20, John Grabowski wrote:
> LGTM!
> 
> Can you keep the old shell script name, but just have it redirect to the new
> name?  Historical use will frustrate people.

yes, sure, I have updated the patch and keep the gdb_content_shell to redirect
to gdb_apk

[commit-bot: I haz the power, 2012-07-12 05:06:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/shouqun.liu@intel.com/10736027/4001

[commit-bot: I haz the power, 2012-07-12 06:59:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/shouqun.liu@intel.com/10736027/6002

[commit-bot: I haz the power, 2012-07-12 08:16:26]

Change committed as 146299