[NaCl SDK] Fix "make debug" and "make run" on Mac.

[NaCl SDK] Fix "make debug" and "make run" on Mac.

There were a couple of issues here:
* make doesn't support spaces, so you have to escape them.
* xterm doesn't exist on mac, use osascript to create a new Terminal window instead.

Also, use the correct basename/default paths for Chrome on each platform.

BUG=322549
R=sbc@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=238245

[binji, 2013-12-02 21:57:14]

ping

[Sam Clegg, 2013-12-02 22:46:50]

lgtm

https://codereview.chromium.org/86053005/diff/20001/native_client_sdk/src/too...
File native_client_sdk/src/tools/getos.py (right):

https://codereview.chromium.org/86053005/diff/20001/native_client_sdk/src/too...
native_client_sdk/src/tools/getos.py:32: }
Isn't this information duplicated here.

Also, I'm pretty sure that / is find on win32 too these days.

[binji, 2013-12-03 00:33:58]

https://codereview.chromium.org/86053005/diff/20001/native_client_sdk/src/too...
File native_client_sdk/src/tools/getos.py (right):

https://codereview.chromium.org/86053005/diff/20001/native_client_sdk/src/too...
native_client_sdk/src/tools/getos.py:32: }
On 2013/12/02 22:46:50, Sam Clegg wrote:
> Isn't this information duplicated here.

Done.

> 
> Also, I'm pretty sure that / is find on win32 too these days.

Everywhere? We don't know where this path is being used, so better to be safe
and use \ I think.

[binji, 2013-12-03 00:35:14]

Committed patchset #3 manually as r238245 (presubmit successful).