Support visualization of incremental builds about ninjatracing HOT 7 OPEN

Sure, patches accepted.

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The implementation I'm using right now is simple and works nicely but doesn't have an option to display all build results overlaid. This also makes multi-file support meaningless.

I'm not sure when multiple input files are used.

I'm thinking of adding a command-line option to select between three options:

1. Displaying all build data overlaid as is currently done.
2. Displaying just the last build.
3. Perhaps displaying subsequent builds with a few seconds of blank space between them - although this might require more effort than I feel like.

My tendency would be to make displaying just the last build be the default since I have never found the full overlay of all build results useful. Thoughts?

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I'm finding it useful to display results from the last 'n' incremental builds, separated by a small gap. I'll try to work up another PR to add that as an option.

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This would indeed be more useful than the current --showall behavior.

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This is a start.

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I have a similar issue in a bigger system which use multiple parallel ninja instances (which might depend on each other). All the individual ninja processes will appear to have started at time 0 which is not correct.

But I guess there is no way to find the absolute start time for each .ninja_log file so I could offset each of them properly?

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I like @Trass3r approach and will use it.
I wanted to make it even better by moving previous builds into past (negative "ts") and latest build starts at 0. But tracing viewer adjusts epoch so that whatever I do oldest build starts at zero.

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