DevTools: Added test that LiveEdit doesn't crash on breakpoint

Crash test case:
1. Open page with javascript
2. Add breakpoint
3. Stop on breakpoint
4. Use live edit and save script
The test worked for Chromium revision until May 30.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=176101

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=176226

[kozyatinskiy1, 2014-06-10 14:27:01]

On 2014/06/10 14:24:03, kozyatinskiy wrote:

Now test fails.
Probably a problem in the following changes in v8:
https://codereview.chromium.org/300793002
https://codereview.chromium.org/301563004

[vsevik, 2014-06-10 15:29:56]

lgtm, we should land this once v8 is fixed.

https://codereview.chromium.org/329533002/diff/1/LayoutTests/inspector/source...
File LayoutTests/inspector/sources/debugger/live-edit.html (right):

https://codereview.chromium.org/329533002/diff/1/LayoutTests/inspector/source...
LayoutTests/inspector/sources/debugger/live-edit.html:124: function
testNoCrashWhenUpdateOnBreakpoint(next)
nit: ..WhenLiveEditOnBreakpoint...

[kozyatinskiy1, 2014-06-10 15:48:44]

On 2014/06/10 15:29:56, vsevik wrote:
> lgtm, we should land this once v8 is fixed.
> 
>
https://codereview.chromium.org/329533002/diff/1/LayoutTests/inspector/source...
> File LayoutTests/inspector/sources/debugger/live-edit.html (right):
> 
>
https://codereview.chromium.org/329533002/diff/1/LayoutTests/inspector/source...
> LayoutTests/inspector/sources/debugger/live-edit.html:124: function
> testNoCrashWhenUpdateOnBreakpoint(next)
> nit: ..WhenLiveEditOnBreakpoint...
Done.

We should check expected result once v8 is fixed.

[vsevik, 2014-06-13 07:00:39]

The CQ bit was checked by vsevik@chromium.org

[commit-bot: I haz the power, 2014-06-13 07:01:37]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/kozyatinskiy@google.com/329533002/40001

[commit-bot: I haz the power, 2014-06-13 08:18:33]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_blink_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/1...)

[commit-bot: I haz the power, 2014-06-13 09:23:17]

Change committed as 176101

[Dirk Pranke, 2014-06-13 20:37:54]

On 2014/06/13 09:23:17, I haz the power (commit-bot) wrote:
> Change committed as 176101

Unfortunately, this change made the test time out on multiple bots
intermittently (i.e., it made the test flaky):

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40...

[vsevik, 2014-06-16 16:15:57]

lgtm

[commit-bot: I haz the power, 2014-06-16 17:20:32]

Change committed as 176226