Convert {angle,gl}_unittests to using console_test_launcher.

testing/buildbot/chromium.gpu.json

 {
   "AAAAA1 AUTOGENERATED FILE DO NOT EDIT": {},
   "AAAAA2 See generate_buildbot_json.py to make changes": {},
   "GPU Linux Builder": {},
   "GPU Linux Builder (dbg)": {},
   "GPU Mac Builder": {},
   "GPU Mac Builder (dbg)": {},
   "GPU Win Builder": {},
   "GPU Win Builder (dbg)": {},
   "Linux Debug (NVIDIA)": {
     "gtest_tests": [
       {
         "args": [
           "--use-gpu-in-tests",
-          "--test-launcher-retry-limit=0"
+          "--test-launcher-retry-limit=0",
+          "--no-xvfb"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Ubuntu"
             }
           ]
         },
@@ skipping 11 matching lines @@
               "gpu": "10de:104a",
               "os": "Ubuntu"
             }
           ]
         },
         "test": "gl_tests",
         "use_xvfb": false
       },
       {
         "args": [
-          "--use-gpu-in-tests"
+          "--use-gpu-in-tests",
+          "--no-xvfb"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Ubuntu"
             }
           ]
         },
@@ skipping 266 matching lines @@
           ]
         }
       }
     ]
   },
   "Linux Release (NVIDIA)": {
     "gtest_tests": [
       {
         "args": [
           "--use-gpu-in-tests",
-          "--test-launcher-retry-limit=0"
+          "--test-launcher-retry-limit=0",
+          "--no-xvfb"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Ubuntu"
             }
           ]
         },
@@ skipping 32 matching lines @@
               "gpu": "10de:104a",
               "os": "Ubuntu"
             }
           ]
         },
         "test": "gl_tests",
         "use_xvfb": false
       },
       {
         "args": [
-          "--use-gpu-in-tests"
+          "--use-gpu-in-tests",
+          "--no-xvfb"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Ubuntu"
             }
           ]
         },
@@ skipping 2301 matching lines @@
             {
               "gpu": "10de:104a",
               "os": "Windows-2008ServerR2-SP1"
             }
           ]
         }
       }
     ]
   }
 }