Extend chromium_tests trigger to work across masters.

scripts/slave/recipes/chromium.expected/full_chromium_perf_Win_Builder.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\kill_processes.py"
     ],
     "name": "taskkill"
   },
   {
@@ skipping 276 matching lines @@
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-      "@@@STEP_TEXT@Win 7 Low-End Perf (1)@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "trigger (2)",
-    "trigger_specs": [
+      },
       {
         "builder_name": "Win 7 Low-End Perf (2)",
         "properties": {
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-    "~followup_annotations": [
-      "@@@STEP_TEXT@Win 7 Low-End Perf (2)@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "trigger (3)",
-    "trigger_specs": [
+      },
       {
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           "parent_got_webrtc_revision_cp": "refs/heads/master@{#120644}"
         }
-      }
-    ],
-    "~followup_annotations": [
-      "@@@STEP_TEXT@Win 7 Perf (1)@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "trigger (4)",
-    "trigger_specs": [
+      },
       {
         "builder_name": "Win 7 Perf (2)",
         "properties": {
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           "parent_got_swarming_client_revision": "a0ee5d99f1d4b38ddaa4c759c837980b63b99566",
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           "parent_got_webrtc_revision_cp": "refs/heads/master@{#120644}"
         }
-      }
-    ],
-    "~followup_annotations": [
-      "@@@STEP_TEXT@Win 7 Perf (2)@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "trigger (5)",
-    "trigger_specs": [
+      },
       {
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         "properties": {
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-      "@@@STEP_TEXT@Win 7 Perf (3)@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "trigger (6)",
-    "trigger_specs": [
+      },
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         }
-      }
-    ],
-    "~followup_annotations": [
-      "@@@STEP_TEXT@Win 7 Perf (4)@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "trigger (7)",
-    "trigger_specs": [
+      },
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     ],
     "~followup_annotations": [
-      "@@@STEP_TEXT@Win 7 Perf (5)@@@"
+      "@@@STEP_TEXT@Win 7 Low-End Perf (1)<br />Win 7 Low-End Perf (2)<br />Win 7 Perf (1)<br />Win 7 Perf (2)<br />Win 7 Perf (3)<br />Win 7 Perf (4)<br />Win 7 Perf (5)@@@"
     ]
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\runtest.py",
       "--target",
       "Release",
@@ skipping 28 matching lines @@
       "Release"
     ],
     "name": "process_dumps"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]