AMP Background Tab: field trial testing configuration.

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 1c1590e7b0f99525257c8d4f91722ae45c525dd2..9ac125205150f238ae0e357bd452faf7c731fb6b 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -19,6 +19,21 @@
             ]
         }
     ],
+    "AmpBackgoundTab": [

[Ilya Sherman, 2017/06/26 19:19:33]

nit: s/gound/ground

[mattcary, 2017/06/27 07:54:08]

Done.

+        {
+            "platforms": [
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "AmpBackgroundTab",

[Ilya Sherman, 2017/06/22 16:42:31]

Actually, sorry, I'm a bit confused.  Reading the server-side config, it looks
like this is the default behavior.  If so, what's the reason for adding a
testing config entry for it?

+                    "enable_features": [
+                        "CCTBackgroundTab"
+                    ]
+                }
+            ]
+        }
+    ],
     "AndroidAIAFetching": [
         {
             "platforms": [