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Adds the infrastructure to support a dynamic feature module for Android
stack unwinding. This module will provide the native code implementation
of a stack unwinder supporting unwinding of stack frames corresponding
to native system libraries and Java code.

This CL contains just the infrastructure to set up the DFM, which
is derived from the existing 'test dummy' DFM. The stack unwinder
implementation and the use of the module from Chrome code are deferred
to later CLs.

Bug: 1027654
Change-Id: I4b5dca1294fa1aa8197eab4544a03dd7d5bc48a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1934774
Commit-Queue: Mike Wittman <wittman@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719373}