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

masters/master.chromium.fyi/master.cfg

Index: masters/master.chromium.fyi/master.cfg
diff --git a/masters/master.chromium.fyi/master.cfg b/masters/master.chromium.fyi/master.cfg
index 5af448563dc3f4a48a16a352cfa8b129e553f58a..200e7ede3cddd46f9e67e49030f111e972adff0f 100644
--- a/masters/master.chromium.fyi/master.cfg
+++ b/masters/master.chromium.fyi/master.cfg
@@ -131,6 +131,7 @@ s_chromium = Scheduler(
                   'CFI Linux CF',
                   'LTO Linux',
                   'LTO Linux Perf',
+                  'ThinLTO Linux ToT',
                   'UBSanVptr Linux',
                   'Win 10 Fast Ring',
                   'Afl Upload Linux ASan',
@@ -1097,6 +1098,13 @@ b_chromium_lto_linux_perf = {
   'auto_reboot': True,
 }
 
+b_chromium_thin_lto_linux_tot = {
+  'name': 'ThinLTO Linux ToT',
+  'factory': m_remote_run_chromium_src('chromium', timeout=12000),
+  'category': 'clang tot',
+  'auto_reboot': True,
+}
+
 b_chromium_ubsan_vptr_linux = {
   'name': 'UBSanVptr Linux',
   'factory': m_remote_run_chromium_src('chromium', timeout=6000),
@@ -1342,6 +1350,9 @@ c['builders'] = [
   b_chromium_lto_linux,
   b_chromium_lto_linux_perf,
 
+  # ThinLTO
+  b_chromium_thin_lto_linux_tot,
+
   # UBSan Vptr
   b_chromium_ubsan_vptr_linux,