update_engine: Split Extent utils from graph_utils.
"Graph" related utils should only concern parts of the code using the
inplace generator, since other generators don't use a dependency graph.
This patch splits the Extent related utils from the graph related ones
creating a new extent_utils.h file.
BUG=None
TEST=unittest still pass.
Change-Id: I0941698b0a47a6cc222e8dc062fc54eb3cdf4de2
Reviewed-on: https://chromium-review.googlesource.com/274899
Reviewed-by: Gilad Arnold <garnold@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
Tested-by: Alex Deymo <deymo@chromium.org>
14 files changed