Unflake and speedup JsNative*Sample cpu profile tests

Unflake and speedup JsNative*Sample cpu profile tests

Instead of running cpu profiler for a hundred milliseconds,
collecting samples distributed in a non-deterministic way all along
the code, make the tests rely on a single sample we collect on
the profiler start.

R=bmeurer@chromium.org, yurys@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=22345

[yurys, 2014-05-27 14:38:19]

https://codereview.chromium.org/301603005/diff/1/test/cctest/test-cpu-profile...
File test/cctest/test-cpu-profiler.cc (right):

https://codereview.chromium.org/301603005/diff/1/test/cctest/test-cpu-profile...
test/cctest/test-cpu-profiler.cc:404: unsigned min_js_samples, bool
start_profile = true,
You can return true from CpuProfilesCollection::StartProfiling when a profile
with given name is being collected. In that case every call of
CpuProfiler::StartProfiling will add current stack trace to the profile  which
is what you need.

[alph, 2014-05-27 14:46:54]

https://codereview.chromium.org/301603005/diff/1/test/cctest/test-cpu-profile...
File test/cctest/test-cpu-profiler.cc (right):

https://codereview.chromium.org/301603005/diff/1/test/cctest/test-cpu-profile...
test/cctest/test-cpu-profiler.cc:404: unsigned min_js_samples, bool
start_profile = true,
On 2014/05/27 14:38:19, yurys wrote:
> You can return true from CpuProfilesCollection::StartProfiling when a profile
> with given name is being collected. In that case every call of
> CpuProfiler::StartProfiling will add current stack trace to the profile  which
> is what you need.

Done.

[yurys, 2014-05-27 14:48:14]

lgtm

[alph, 2014-05-28 12:06:42]

ptal

[Benedikt Meurer, 2014-06-23 04:51:50]

LGTM

[alph, 2014-07-11 09:06:22]

Committed patchset #3 manually as r22345 (presubmit successful).