Add art::GetAndroidRuntimeRootSafe and art::GetAndroidRuntimeRoot.

Test: m test-art-host-gtest-file_utils_test
Bug: 129063331
Merged-In: Ib1f188e448b46891ae6fea713a5e92f5e160f060
Change-Id: Ib1f188e448b46891ae6fea713a5e92f5e160f060
(cherry picked from commit 1ea8a62e320cb53b65910093b35240b3139b2cfa)
3 files changed