Update blimp build bot args match build/args/blimp_engine.gn

tools/mb/mb_config.pyl

Index: tools/mb/mb_config.pyl
diff --git a/tools/mb/mb_config.pyl b/tools/mb/mb_config.pyl
index 37f531e24dc3112f52699b0e29c3dc6c633269cd..8033a8bdbb9e68c4a7889a2dffefaa4606b157aa 100644
--- a/tools/mb/mb_config.pyl
+++ b/tools/mb/mb_config.pyl
@@ -1567,11 +1567,14 @@
     # Removes dependencies on X11 and audio libraries for a containerized
     # build.
     'blimp': {
-      'gn_args': ('use_aura=true use_ozone=true use_alsa=false '
-                  'use_pulseaudio=false use_cups=false use_glib=false '
-                  'use_low_quality_image_interpolation=true'),
-      'gyp_defines': ('use_aura=1 use_ozone=1 use_alsa=0 '
-                      'use_pulseaudio=0 use_cups=0 use_glib=0'),
+      # This list must be kept in sync with the list in
+      # //build/args/blimp_engine.gn.
+      'gn_args': ('use_aura=true use_ozone=true ozone_auto_platforms=false '
+                  'ozone_platform="headless" ozone_platform_headless=true '
+                  'metrics_use_blimp=true '
+                  'use_low_quality_image_interpolation=true use_alsa=false '
+                  'use_pulseaudio=false use_cups=false use_glib=false'),
+      'gyp_defines': 'target_arch=unknown',
     },
 
     'cast': {