android/filesystems/fstab_parser.h: New file.

This patch adds a tiny parser for Linux fstab files in order
to extract the format of a given partition. This will be used
in the future to extract from ramdisk.img the exact partition
format of each partitionm image, instead of trying to guess it
from API levels.

Change-Id: Ia9d986d1487ea092e05af567fd4abb42b58cc1f6
diff --git a/Makefile.tests b/Makefile.tests
index 2daabff..bcaca81 100644
--- a/Makefile.tests
+++ b/Makefile.tests
@@ -23,6 +23,7 @@
   android/base/StringView_unittest.cpp \
   android/emulation/CpuAccelerator_unittest.cpp \
   android/filesystems/ext4_utils_unittest.cpp \
+  android/filesystems/fstab_parser_unittest.cpp \
   android/filesystems/partition_types_unittest.cpp \
   android/filesystems/ramdisk_extractor_unittest.cpp \
   android/filesystems/testing/TestSupport.cpp \