Convert ipc_tests to run exclusively on Swarming

testing/buildbot/chromium.win.json

Index: testing/buildbot/chromium.win.json
diff --git a/testing/buildbot/chromium.win.json b/testing/buildbot/chromium.win.json
index 6346137a914e81a6c149f099ef97ea4a79d517b6..e0e2e5c69ae7bb0cf7a49fa06cf82435feb77d8c 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -130,6 +130,9 @@
         "test": "interactive_ui_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ipc_tests"
       },
       {
@@ -389,6 +392,9 @@
         "test": "interactive_ui_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ipc_tests"
       },
       {
@@ -776,6 +782,9 @@
         "test": "interactive_ui_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ipc_tests"
       },
       {
@@ -1032,6 +1041,9 @@
         "test": "interactive_ui_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ipc_tests"
       },
       {
@@ -1456,6 +1468,9 @@
         "test": "ipc_mojo_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ipc_tests"
       },
       {