Added a few new debugger tests.

Added a few new debugger tests.

Committed: http://code.google.com/p/v8/source/detail?r=6222

[marklam, 2011-01-06 04:28:19]

Hi Søren,

Here are 2 new debugger unit tests that test the functionality of
listbreakpoints and setexceptionbreak.  In rev 6180, I only
modified the implementation of listbreakpoints by adding the
status of the break on exception states.  However, I didn't see
a pre-existing test for listbreakpoints.  So I took a stab at it while
adding the test for the effects for setexceptionbreak.
I did not exhaustively implement tests for all of listbreakpoints'
possible return values but did what I could with the breakpoint
numbers as well as their corresponding line numbers.  I hope
that is enough for now.

The other debugger functionality I added in r6180 includes gc,
v8flags, and disconnect.  I could not think of any reasonable tests
that I can write with the existing infrastructure.  So, I'm going to
ignore those for now.

Please let me know if you think I need to add more tests for the
functionality that I've introduced.  Thanks.

Note: these tests will fail if r6180 is not reapplied to the code
base.

[Søren Thygesen Gjesse, 2011-01-07 12:01:14]

LGTM

Committed: http://code.google.com/p/v8/source/detail?r=6222

Regarding the gc and setflags requests you could just add sanity checks that the
requests are recognized and return a response with the expected properties.