Adding variable builders for all builders under master "chromium.chrome"

masters/master.tryserver.chromium.linux/slaves.cfg

Index: masters/master.tryserver.chromium.linux/slaves.cfg
diff --git a/masters/master.tryserver.chromium.linux/slaves.cfg b/masters/master.tryserver.chromium.linux/slaves.cfg
index cd8ef32450b67feb0e77165d21cb251b466e3d86..791e8d3b3b3bfa31d8e2748cdcaf37a8fef72c42 100644
--- a/masters/master.tryserver.chromium.linux/slaves.cfg
+++ b/masters/master.tryserver.chromium.linux/slaves.cfg
@@ -50,6 +50,7 @@ def linux():
     'linux_chromium_chromeos_dbg_ng',
     'linux_chromium_chromeos_msan_rel_ng',
     'linux_chromium_chromeos_variable',
+    'linux_chromium_chromeos_variable_chrome',
     'linux_chromium_clang_upload',
     'linux_chromium_compile_rel_ng',
     'linux_chromium_dbg_ng',
@@ -59,6 +60,7 @@ def linux():
     'linux_chromium_tsan_rel_ng',
     'linux_chromium_practice_rel_ng',
     'linux_chromium_variable',
+    'linux_chromium_variable_chrome',
     'linux_chromium_variable_clobber',
     'linux_deterministic',
     'linux_ecs_ozone',
@@ -72,6 +74,7 @@ def linux():
   optional_32_slaves = [897]
   optional_32_builders = [
     'linux_chromium_variable_32',
+    'linux_chromium_variable_32_chrome',
     'linux_chromium_variable_32_clobber',
   ]