Add ThemePicker instrumented tests to presubmit

Fixes: 249505965
Test: Test changes only
Change-Id: I368211dc8c095e4a5d385a7cdaf81b861fd23d8d
diff --git a/TEST_MAPPING b/TEST_MAPPING
new file mode 100644
index 0000000..0bde595
--- /dev/null
+++ b/TEST_MAPPING
@@ -0,0 +1,12 @@
+{
+  "presubmit": [
+    {
+      "name": "ThemePickerTests",
+      "options": [
+        {
+          "exclude-annotation": "org.junit.Ignore"
+        }
+      ]
+    }
+  ]
+}