The method forces all running profilers attached to the provided isolate
to collect a sample with the current stack.

It is going to be used to synchronize trace events generated by embedder with the samples
collected by the profiler.

Also it will finally allow us to break dependency of isolate on CPU profiler.

BUG=chromium:721099

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I81a0f8a463f837b5201bc8edaf2eb4f3761e3ff8
Reviewed-on: https://chromium-review.googlesource.com/750264Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49236}