Rename "test" ozone platform to "headless"

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 56dc197b40e0b1b7d5740c45aa57bdf4cafc4b76..0b953bbf4e4204fe8da51877ebb983a2e7871db8 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1547,10 +1547,10 @@
     # Ozone platforms to include in the build.
     'ozone_platform_caca%': 0,
     'ozone_platform_cast%': 0,
-    'ozone_platform_egltest%': 0,
+    'ozone_platform_eglheadless%': 0,
     'ozone_platform_gbm%': 0,
     'ozone_platform_ozonex%': 0,
-    'ozone_platform_test%': 0,
+    'ozone_platform_headless%': 0,
 
     # Experiment: http://crbug.com/426914
     'envoy%': 0,
@@ -2392,8 +2392,8 @@
         # Build all platforms whose deps are in install-build-deps.sh.
         # Only these platforms will be compile tested by buildbots.
         'ozone_platform_gbm%': 1,
-        'ozone_platform_test%': 1,
-        'ozone_platform_egltest%': 1,
+        'ozone_platform_headless%': 1,
+        'ozone_platform_eglheadless%': 1,
       }],
 
       ['desktop_linux==1 and use_aura==1 and use_x11==1', {