Add more trybots to the default set.

All these seem to be green but doesn't run by default.

TBR=fbarchard@chromium.org

Review URL: https://codereview.chromium.org/2064343002 .

PRESUBMIT.py

@@ -28,6 +28,9 @@ def GetPreferredTryMasters(project, change):
     'win_x64_rel',
     'win_x64_gn',
     'win_x64_gn_rel',
+    'win_clang',
+    'win_clang_rel',
+    'win_x64_clang_rel',
     'mac',
     'mac_rel',
     'mac_gn',
@@ -51,6 +54,9 @@ def GetPreferredTryMasters(project, change):
     'android_rel',
     'android_clang',
     'android_arm64',
+    'android_mips',
+    'android_x64',
+    'android_x86',
     'android_gn',
     'android_gn_rel',
   ]