Convert {angle,gl}_unittests to using console_test_launcher.

content/test/gpu/generate_buildbot_json.py

Index: content/test/gpu/generate_buildbot_json.py
diff --git a/content/test/gpu/generate_buildbot_json.py b/content/test/gpu/generate_buildbot_json.py
index 5c1c8babd0cc620095b9ef49baac913dcd0a33b1..d929c700e3b15a720dd5476df52319f5993c6087 100755
--- a/content/test/gpu/generate_buildbot_json.py
+++ b/content/test/gpu/generate_buildbot_json.py
@@ -1295,7 +1295,8 @@ COMMON_GTESTS = {
       # ANGLE test retries deliberately disabled to prevent flakiness.
       # http://crbug.com/669196
       '--test-launcher-retry-limit=0'
-    ]
+    ],
+    'linux_args': [ '--no-xvfb' ]
   },
   # Until the media-only tests are extracted from content_unittests,
   # and audio_unittests and content_unittests can be run on the commit
@@ -1347,7 +1348,8 @@ COMMON_GTESTS = {
         ],
       },
     ],
-    'desktop_args': ['--use-gpu-in-tests']
+    'desktop_args': ['--use-gpu-in-tests'],
+    'linux_args': [ '--no-xvfb' ]
   },
   # The gles2_conform_tests are closed-source and deliberately only run
   # on the FYI waterfall and the optional tryservers.