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This CL implements NativeUnwinderAndroid & tests for android
unwinding support. It also enables StackSamplingProfilerTest
on Android.

A new target source_set is added, native_unwinder_android
that contains NativeUnwinderAndroid.
StackSamplingProfilerTest depends on it for android.

Bug: 989102
Change-Id: Ie38fd99ca5fb053e1881d0977924b70a6fbc1e9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2055743
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759283}