Fix the xrange calculation of the V8 timeline plot

Fix the xrange calculation of the V8 timeline plot

Currently an xrange is calculated by V8.Execution. This would be fine for JavaScript benchmarks in which everything happens inside of V8.Execution. On the other hand, in Chrome profiling, events can happen outside of V8.Execution. To visualize such outside events, we need to calculate an xrange so that the xrange covers all events.

BUG=

Committed: https://code.google.com/p/v8/source/detail?r=13414

[haraken, 2013-01-17 13:47:01]

yang: This is a minor fix to the V8 timeline plot for real-world profiling.
Would you take a look?

[Yang, 2013-01-17 14:44:44]

On 2013/01/17 13:47:01, haraken1 wrote:
> yang: This is a minor fix to the V8 timeline plot for real-world profiling.
> Would you take a look?

This is sort of debatable. I coded it this way intentionally since I was only
interested in the parts where V8 executed code, but I guess this would make more
sense generally, so LGTM.

I'm going to land this for you.