Converted accessibility_unittests to run on Swarming everywhere.

testing/buildbot/chromium.fyi.json

Index: testing/buildbot/chromium.fyi.json
diff --git a/testing/buildbot/chromium.fyi.json b/testing/buildbot/chromium.fyi.json
index 8ef2cb1b47fdfdc9ad89d78b1a63b8190c745f19..5b79c8ea773b57214e2cae964928298c855fea15 100644
--- a/testing/buildbot/chromium.fyi.json
+++ b/testing/buildbot/chromium.fyi.json
@@ -210,6 +210,9 @@
   "ClangToTLinux tester": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "accessibility_unittests"
       },
       {
@@ -370,6 +373,9 @@
   "ClangToTLinuxASan tester": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "accessibility_unittests"
       },
       {
@@ -1596,6 +1602,9 @@
   "Linux Trusty": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "accessibility_unittests"
       },
       {
@@ -1761,6 +1770,9 @@
   "Linux Trusty (32)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "accessibility_unittests"
       },
       {
@@ -1926,6 +1938,9 @@
   "Linux Trusty (dbg)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "accessibility_unittests"
       },
       {
@@ -2091,6 +2106,9 @@
   "Linux Trusty (dbg)(32)": {
     "gtest_tests": [
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "accessibility_unittests"
       },
       {