Add V8Ignition field-trial.

testing/variations/fieldtrial_testing_config.json

Index: testing/variations/fieldtrial_testing_config.json
diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index e7b4967f864f60bad23a6e5847145d9756f2a556..729303b492769ca85769f8508be252c8731d8e8d 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -2859,6 +2859,25 @@
             ]
         }
     ],
+    "V8Ignition": [
+        {
+            "platforms": [
+                "android",
+                "chromeos",
+                "linux",
+                "mac",
+                "win"
+            ],
+            "experiments": [
+                {
+                    "name": "Control3"
+                },
+                {
+                    "name": "Future"

[rkaplow, 2017/03/13 17:10:06]

this only can test one, so I would add jsut Future here (assuming that's the
main feature being tested)

[rmcilroy, 2017/03/14 09:57:49]

Done.

+                }
+            ]
+        }
+    ],
     "ViewsSimplifiedFullscreenUI": [
         {
             "platforms": [