Add 'ThinLTO Linux ToT' buildbot (recipes part).

scripts/slave/recipe_modules/chromium_tests/chromium_fyi.py

Index: scripts/slave/recipe_modules/chromium_tests/chromium_fyi.py
diff --git a/scripts/slave/recipe_modules/chromium_tests/chromium_fyi.py b/scripts/slave/recipe_modules/chromium_tests/chromium_fyi.py
index c6a15fb5736e2e01ff0935e3d661a3aaef0c2079..8d61d376005796bb7d926b57e86b3929e10cdaed 100644
--- a/scripts/slave/recipe_modules/chromium_tests/chromium_fyi.py
+++ b/scripts/slave/recipe_modules/chromium_tests/chromium_fyi.py
@@ -430,6 +430,24 @@ SPEC = {
         'platform': 'linux',
       },
     },
+    'ThinLTO Linux ToT': {
+      'chromium_config': 'chromium',
+      'chromium_apply_config': ['clang_tot', 'mb'],
+      'gclient_config': 'chromium',
+      'chromium_config_kwargs': {
+        'BUILD_CONFIG': 'Release',
+        'TARGET_BITS': 64,
+      },
+      'test_generators': [
+        steps.generate_gtest,
+        steps.generate_script,
+        steps.generate_isolated_script,
+      ],
+      'bot_type': 'builder_tester',
+      'testing': {
+        'platform': 'linux',
+      },
+    },
     'UBSanVptr Linux': {
       'chromium_config': 'chromium',
       'chromium_apply_config': ['mb'],