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/oemcrypto/test/oemcrypto_test_android.cpp

@@ -78,6 +78,15 @@ TEST_F(OEMCryptoAndroidLMPTest, SupportsUsageTable) {
   ASSERT_TRUE(OEMCrypto_SupportsUsageTable());
 }
 
+TEST_F(OEMCryptoAndroidLMPTest, Level1Required) {
+  const char* char_level = OEMCrypto_SecurityLevel();
+  std::string security_level(char_level ? char_level : "");
+  EXPECT_EQ("L1", security_level)
+      << "The security level is " << security_level << ". but we expect L1.\n"
+      << "If you are testing a device that should be L3 or L2, please\n"
+      << "repeat the tests with the flag --gtest_filter=\"*-*Level1Required\"";
+}
+
 // These tests are required for M Android devices.
 class OEMCryptoAndroidMNCTest : public  OEMCryptoAndroidLMPTest {};