Creates a getMeasurementsSummaryMap in ReactDefaultPerf

[pablolmiranda]

=== Problem
ReactDefaultPerf has a printWasted function that uses console.table to show the results of the performance measurements.
PhantomJS doesn't have the console.table function, so it's hard to get the metrics and present them in a CI pipeline.

=== Solution
Create a ReactDefaultPerf.getMeasurementsSummaryMap that receives a set of measurements and just generate the summary map.
This solution make possible to get the performance summary and format them as you like. Even using console.log().

// very simple example
console.log(
    Perf.getMeasurementsSummaryMap(Perf.getLastMeasurements())
);

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[pablolmiranda]

CLA signed.

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[zpao]

cc @petehunt @joshduck

[joshduck]

Is it possible to call ReactDefaultPerfAnalysis.getInclusiveSummary directly in your CI pipeline?

[pablolmiranda]

It's not because we are bundling everything for functional test.
We could we maintain one fork publishing the ReactDefaultPerfAnalysis.getInclusiveSummary in the addons public interface. But I would not like to diverge from the main repo.
There is reason for not expose a proxy to the performance analysis summary?

[joshduck]

Space before the curly brace.