Support for Chrome 58+ style profiles

[nckswt]

Preamble

pyflame -v: pyflame 1.6.6 linux-gnu x86_64 (ABI list: 26 34)
python --version: Python 2.7.12
No error messages.

Issue

I've noticed that the --flamechart option to generate profiles viewable in Chrome DevTools only generates the old-style (Chrome 58 or below) .cpuprofile files, which tend to be far less useful for introspection. Is there a way to either generate or convert the old-style profiles into new-style profiles that could be loaded into the Performance tab of the DevTools console?