Extend chromium_tests trigger to work across masters.

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

Index: scripts/slave/recipes/chromium.expected/full_chromium_perf_Linux_Builder.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_perf_Linux_Builder.json b/scripts/slave/recipes/chromium.expected/full_chromium_perf_Linux_Builder.json
index d145f2c4c2c265654ba7297e14e5ee99d566e975..1d764b7e2a4243ca274cc83c34afa43844462131 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_perf_Linux_Builder.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_perf_Linux_Builder.json
@@ -270,6 +270,7 @@
     "name": "trigger",
     "trigger_specs": [
       {
+        "bucket": "master.chromium.perf",
         "builder_name": "Linux Perf (1)",
         "properties": {
           "parent_got_angle_revision": "fac9503c46405f77757b9a728eb85b8d7bc6080c",
@@ -285,17 +286,9 @@
           "parent_got_webrtc_revision": "0f90628433546e61d9268596da93418c623137f4",
           "parent_got_webrtc_revision_cp": "refs/heads/master@{#120644}"
         }
-      }
-    ],
-    "~followup_annotations": [
-      "@@@STEP_TEXT@Linux Perf (1)@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "trigger (2)",
-    "trigger_specs": [
+      },
       {
+        "bucket": "master.chromium.perf",
         "builder_name": "Linux Perf (2)",
         "properties": {
           "parent_got_angle_revision": "fac9503c46405f77757b9a728eb85b8d7bc6080c",
@@ -311,17 +304,9 @@
           "parent_got_webrtc_revision": "0f90628433546e61d9268596da93418c623137f4",
           "parent_got_webrtc_revision_cp": "refs/heads/master@{#120644}"
         }
-      }
-    ],
-    "~followup_annotations": [
-      "@@@STEP_TEXT@Linux Perf (2)@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "trigger (3)",
-    "trigger_specs": [
+      },
       {
+        "bucket": "master.chromium.perf",
         "builder_name": "Linux Perf (3)",
         "properties": {
           "parent_got_angle_revision": "fac9503c46405f77757b9a728eb85b8d7bc6080c",
@@ -337,17 +322,9 @@
           "parent_got_webrtc_revision": "0f90628433546e61d9268596da93418c623137f4",
           "parent_got_webrtc_revision_cp": "refs/heads/master@{#120644}"
         }
-      }
-    ],
-    "~followup_annotations": [
-      "@@@STEP_TEXT@Linux Perf (3)@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "trigger (4)",
-    "trigger_specs": [
+      },
       {
+        "bucket": "master.chromium.perf",
         "builder_name": "Linux Perf (4)",
         "properties": {
           "parent_got_angle_revision": "fac9503c46405f77757b9a728eb85b8d7bc6080c",
@@ -363,17 +340,9 @@
           "parent_got_webrtc_revision": "0f90628433546e61d9268596da93418c623137f4",
           "parent_got_webrtc_revision_cp": "refs/heads/master@{#120644}"
         }
-      }
-    ],
-    "~followup_annotations": [
-      "@@@STEP_TEXT@Linux Perf (4)@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "trigger (5)",
-    "trigger_specs": [
+      },
       {
+        "bucket": "master.chromium.perf",
         "builder_name": "Linux Perf (5)",
         "properties": {
           "parent_got_angle_revision": "fac9503c46405f77757b9a728eb85b8d7bc6080c",
@@ -392,7 +361,7 @@
       }
     ],
     "~followup_annotations": [
-      "@@@STEP_TEXT@Linux Perf (5)@@@"
+      "@@@STEP_TEXT@Linux Perf (1)<br />Linux Perf (2)<br />Linux Perf (3)<br />Linux Perf (4)<br />Linux Perf (5)@@@"
     ]
   },
   {