TestMappingSuiteRunner: Add @Option test-mapping-path.

This CL is to add @Option test-mapping-path to allow TMSR running
tests according to the TEST_MAPPING file from the specified paths.

Bug: 117880789

Test: unittests.
Change-Id: Ibb9ffa82c4658b72c25429c810f00e0b69d50f30
Merged-In: Ibb9ffa82c4658b72c25429c810f00e0b69d50f30
diff --git a/src/com/android/tradefed/testtype/suite/TestMappingSuiteRunner.java b/src/com/android/tradefed/testtype/suite/TestMappingSuiteRunner.java
index b13ffa7..8422e96 100644
--- a/src/com/android/tradefed/testtype/suite/TestMappingSuiteRunner.java
+++ b/src/com/android/tradefed/testtype/suite/TestMappingSuiteRunner.java
@@ -67,6 +67,12 @@
     )
     private Set<String> mTestModulesForced = new HashSet<>();
 
+    @Option(
+        name = "test-mapping-path",
+        description = "Run tests according to the test mapping path."
+    )
+    private List<String> mTestMappingPaths = new ArrayList<>();
+
     /** Special definition in the test mapping structure. */
     private static final String TEST_MAPPING_INCLUDE_FILTER = "include-filter";