PRESUBMIT: Add GN bots to default trybots

BUG=601140
TBR=fbarchard@chromium.org

Review URL: https://codereview.chromium.org/1878763002 .

PRESUBMIT.py

@@ -26,15 +26,21 @@ def GetPreferredTryMasters(project, change):
     'win',
     'win_rel',
     'win_x64_rel',
+    'win_x64_gn',
+    'win_x64_gn_rel',
     'mac',
     'mac_rel',
+    'mac_gn',
+    'mac_gn_rel',
+    'mac_asan',
     'ios',
     'ios_rel',
     'ios_arm64',
     'ios_arm64_rel',
-    'mac_asan',
     'linux',
     'linux_rel',
+    'linux_gn',
+    'linux_gn_rel',
     'linux_memcheck',
     'linux_tsan2',
     'linux_asan',
@@ -45,6 +51,8 @@ def GetPreferredTryMasters(project, change):
     'android_rel',
     'android_clang',
     'android_arm64',
+    'android_gn',
+    'android_gn_rel',
   ]
   if not files or all(re.search(r'[\\/]OWNERS$', f) for f in files):
     return {}