Add support for messages.json format used to localize Chrome extensions.

Add support for messages.json format used to localize Chrome extensions.

Chrome uses JSON format for extension and webapps localization. This change 
adds new output format chrome_messages_json. It will be used to generate
resrouces for Chrome Remote Desktop webapp.

Committed: https://code.google.com/p/grit-i18n/source/detail?r=77

[Jói, 2012-10-15 10:31:06]

Thanks Sergey.

I'd like to see a small unit test for this new formatter.  Also, see question
below.

Cheers,
Jói

http://codereview.chromium.org/11152002/diff/5001/grit/format/chrome_messages...
File grit/format/chrome_messages_json.py (right):

http://codereview.chromium.org/11152002/diff/5001/grit/format/chrome_messages...
grit/format/chrome_messages_json.py:29: loc_message = re.sub(r'"', r'\"',
loc_message)
What about \ in the message, do they need to be escaped as \\ ?

[Sergey Ulanov, 2012-10-16 00:50:24]

Added unittest and fixed issue with backslash formatting.

http://codereview.chromium.org/11152002/diff/5001/grit/format/chrome_messages...
File grit/format/chrome_messages_json.py (right):

http://codereview.chromium.org/11152002/diff/5001/grit/format/chrome_messages...
grit/format/chrome_messages_json.py:29: loc_message = re.sub(r'"', r'\"',
loc_message)
On 2012/10/15 10:31:06, Jói wrote:
> What about \ in the message, do they need to be escaped as \\ ?

That's a good point. I took these two lines from js_map_format.py - it had this
bug as well. Fixed it too.

[Jói, 2012-10-16 10:24:21]

LGTM

I've added you (sergeyu@chromium.org) as a committer, so you should be able to
commit this yourself.  Let me know if you need help.

Cheers,
Jói