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There are existing POSIX implementations for these methods in
stack_sampler_posix.cc. We now use stack_sampler_android.cc on Android
and stack_sampler_posix.cc on all other POSIX platforms.

Note that there's an existing StackSamplerAndroid that exists in the
tracing namespace. However, that implementation is only used for the
"cpu_profiler" tracing category, whereas this implementation will be
used for stack sampled metrics. Once this new Android profiler is
sufficiently complete, it will also be used for tracing.
This stack_sampler_android.cc defers to StackSamplerImpl for its core
logic (also used by the Windows and Mac sampling profiler
implementations), whereas tracing's stack_sampler_android doesn't use
StackSamplerImpl and implements its own core logic.

R=wittman@chromium.org,gab@chromium.org

Bug: 988574
Change-Id: Ia1f20a22ac1421ff02d4beecff4beb6b7a0e065f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1727230Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Commit-Queue: Charlie Andrews <charliea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682446}