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Implements the ThreadDelegate abstraction for Android, providing the
stack base address and registers that may require rewriting to update
them from pointing to the original stack to the copied stack.

Removes code from the TracingSamplerProfiler that was attempting
to use the StackSamplingProfiler with the built-in Android
StackSampler. This had no effect previously and crashes with the
current skeleton implementation. Tracing will be able to use the
built-in sampler when it's in a more mature state.

Bug: 988579
Change-Id: I4c44bbec33f2e1457c03de37d8c852a85eb9d65b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764288Reviewed-by: Charlie Andrews <charliea@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Commit-Queue: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694911}