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The frame that's currently executing can be immediately recorded from
the values in the register context, independent of any unwinding.
This change separates the initial frame recording from the recording
within the native unwinding, which will be required to support restarting
native unwinding after v8 unwinding.

Also adds comments documenting the overall structure of the frame unwind
algorithm.

Bug: 909957
Change-Id: I981fe7c7c8b6019d8fc34dcdb08c22ec744b08ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1540314
Commit-Queue: Mike Wittman <wittman@chromium.org>
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645310}