Add test suite handling to central androidmk code

MTS is introducing partial MTS test suites that are per-module, with
names of the format: mts-${MODULE}. By centralizing the code for test
suites, we can automatically add "mts" test suite when an
"mts-${MODULE}" test suite is specified, reducing duplication.

Test: m mts
Bug: 170318013
Change-Id: I8ce9d3c252fcc0a937bb5f2826d21cb6c6932d82
diff --git a/android/androidmk.go b/android/androidmk.go
index 063830b..a670656 100644
--- a/android/androidmk.go
+++ b/android/androidmk.go
@@ -177,6 +177,18 @@
 	a.EntryMap[name] = append(a.EntryMap[name], value...)
 }
 
+// AddCompatibilityTestSuites adds the supplied test suites to the EntryMap, with special handling
+// for partial MTS test suites.
+func (a *AndroidMkEntries) AddCompatibilityTestSuites(suites ...string) {
+	// MTS supports a full test suite and partial per-module MTS test suites, with naming mts-${MODULE}.
+	// To reduce repetition, if we find a partial MTS test suite without an full MTS test suite,
+	// we add the full test suite to our list.
+	if PrefixInList(suites, "mts-") && !InList("mts", suites) {
+		suites = append(suites, "mts")
+	}
+	a.AddStrings("LOCAL_COMPATIBILITY_SUITE", suites...)
+}
+
 // The contributions to the dist.
 type distContributions struct {
 	// List of goals and the dist copy instructions.
diff --git a/android/csuite_config.go b/android/csuite_config.go
index a5b1533..bf24d98 100644
--- a/android/csuite_config.go
+++ b/android/csuite_config.go
@@ -44,7 +44,7 @@
 			if me.properties.Test_config != nil {
 				entries.SetString("LOCAL_TEST_CONFIG", *me.properties.Test_config)
 			}
-			entries.AddStrings("LOCAL_COMPATIBILITY_SUITE", "csuite")
+			entries.AddCompatibilityTestSuites("csuite")
 		},
 	}
 	return []AndroidMkEntries{androidMkEntries}