Verify OEMCrypto supports Level 1

Merge from widevine repo of http://go/wvgerrit/14708

This CL adds a test to verify that oemcrypto is a level 1 device.  It
is part of oemcrypto_test_android.cpp, so it only applies to android
devices and to the widevine buildbot which also runs the android tests.

bug: 21814204

Change-Id: Icbcdd3496fb8a656891bd7c873c60cba23c9666a

libwvdrmengine/run_all_unit_tests.sh

@@ -3,8 +3,16 @@
 final_result=0
 failed_tests=()
 
+# Below, we will append filters to the exclusion portion of GTEST_FILTER, so we
+# need to guarantee it has one.
 if [ -z "$GTEST_FILTER" ]; then
-  GTEST_FILTER="*"
+  # If it wasn't set, make it add all tests, and remove none.
+  GTEST_FILTER="*-"
+# if GTEST_FILTER already has a negative sign, we leave it alone.
+elif [ 0 -eq `expr index "$GTEST_FILTER" "-"` ]; then
+  # If GTEST_FILTER was set, but does not have a negative sign, add one.  This
+  # gives gtest an empty list of tests to skip.
+  GTEST_FILTER="$GTEST_FILTER-"
 fi
 
 # Execute a command in "adb shell" and capture the result.
@@ -28,7 +36,8 @@ fi
 echo "waiting for device"
 adb root && adb wait-for-device remount
 
-adb_shell_run FORCE_LEVEL3_OEMCRYPTO=yes /system/bin/oemcrypto_test
+adb_shell_run GTEST_FILTER="$GTEST_FILTER:*Level1Required" FORCE_LEVEL3_OEMCRYPTO=yes \
+  /system/bin/oemcrypto_test
 adb_shell_run /system/bin/oemcrypto_test
 adb_shell_run /system/bin/request_license_test
 # cdm_extended_duration_test takes >30 minutes to run.