Add timed out test files to tidy_timeout_srcs

* Timed out runs do not show any warning messages.
* These test files cannot finish clang-tidy runs with
  the following settings:
    TIDY_TIMEOUT=90
    WITH_TIDY=1
    CLANG_ANALYZER_CHECKS=1
* When TIDY_TIMEOUT is set, in Android continuous builds,
  tidy_timeout_srcs files will not be compiled by clang-tidy.
  When developers build locally without TIDY_TIMEOUT,
  tidy_timeout_srcs files will be compiled.
* Some of these test modules may be split into smaller ones,
  or disable some time consuming checks, and then
  enable clang-tidy to run within limited time.

Bug: 201099167
Test: make droid tidy-system-testing_subset
Change-Id: I7dc4d1a95cf6352bafa60374ac03e3473ac272a6
diff --git a/Android.bp b/Android.bp
index ef855f2..a1626fe 100644
--- a/Android.bp
+++ b/Android.bp
@@ -64,6 +64,10 @@
 cc_test {
     name: "gtest_isolated_tests",
     host_supported: true,
+    tidy_timeout_srcs: [
+        "tests/OptionsTest.cpp",
+        "tests/SystemTests.cpp",
+    ],
     srcs: [
         "tests/OptionsTest.cpp",
         "tests/SystemTests.cpp",