Add gpu_ipc_service_unittests to buildbot configs

testing/buildbot/chromium.linux.json

Index: testing/buildbot/chromium.linux.json
diff --git a/testing/buildbot/chromium.linux.json b/testing/buildbot/chromium.linux.json
index a4d6a2c342f051b5cc2e82a565260b918e842d3a..2200f7d1dc890b6a6d03c0244625771fb0384bd6 100644
--- a/testing/buildbot/chromium.linux.json
+++ b/testing/buildbot/chromium.linux.json
@@ -59,6 +59,9 @@
         "test": "gl_unittests"
       },
       {
+        "test": "gpu_ipc_service_unittests"
+      },
+      {
         "test": "gpu_unittests"
       },
       {
@@ -234,6 +237,9 @@
         "test": "gl_unittests"
       },
       {
+        "test": "gpu_ipc_service_unittests"
+      },
+      {
         "test": "gpu_unittests"
       },
       {
@@ -360,6 +366,9 @@
         "test": "gl_unittests"
       },
       {
+        "test": "gpu_ipc_service_unittests"
+      },
+      {
         "test": "gpu_unittests"
       },
       {
@@ -505,6 +514,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "gpu_ipc_service_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "gpu_unittests"
       },
       {
@@ -796,6 +811,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "gpu_ipc_service_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "gpu_unittests"
       },
       {
@@ -1271,6 +1292,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "gpu_ipc_service_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "gpu_unittests"
       },
       {