commit 8090b2e824e4959de4cf6eabde5122c3e2f46de6
author Christopher Ferris <cferris@google.com> Fri Aug 16 10:49:34 2019 -0700
committer Christopher Ferris <cferris@google.com> Fri Aug 23 10:07:44 2019 -0700
tree c4601c5d8c7dff4ef9c44ae7939b13a8b4f3bebe
parent da2c7267412201c4c7dfc410e1ecedf391f08e76

Add ReadMapFileAsyncSafe function.

This is a function designed so that it doesn't do any allocations.
It's purpose is for testing allocation related code where doing an
allocation can disturb the test.

Added unit tests for the new code that disable memory allocations
before running.

Also, made the tests run in isolation mode since I added a bunch of
tests and this will keep the total runtime about the same as
before.

Bug: 137795072

Test: All unit tests pass.
Change-Id: I7645f1e9f88cdfbc57c8eebce80199b9cfae64c1