Make unit tests build and run on Chrome OS.

Bug: 34520446
Test: Builds on desktop Linux, Android, Chrome OS.
Change-Id: Icb14aa4f6bd15950d082fc78bc4b28095e0b0af0
diff --git a/.gitignore b/.gitignore
index ac10fcb..3013935 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,5 +12,8 @@
 minijail0
 syscall_filter_unittest
 
+# common.mk TEST().
+*.test
+
 # Google Test.
 googletest-release*