Deploy Linux slave with AMD R7 240 to chromium.gpu.fyi.

BUG=637037
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
NOTRY=true

Review-Url: https://codereview.chromium.org/2257513003
Cr-Commit-Position: refs/heads/master@{#412686}

content/test/gpu/generate_buildbot_json.py

@@ -408,6 +408,17 @@ FYI_WATERFALL = {
       'swarming': False,
       'os_type': 'linux',
     },
+    'Linux Release (AMD R7 240)': {
+      'swarming_dimensions': {
+        'gpu': '1002:6613',
+        'os': 'Linux'
+      },
+      'build_config': 'Release',
+      # This bot is a one-off and doesn't have similar slaves in the
+      # swarming pool.
+      'swarming': False,
+      'os_type': 'linux',
+    },
     'Android Release (Nexus 5)': {
       'swarming_dimensions': {
         # There are no PCI IDs on Android.

tools/mb/mb_config.pyl

@@ -313,6 +313,7 @@
         'swarming_gpu_fyi_tests_chromeos_gn_release_trybot',
       'Linux Debug (NVIDIA)': 'none',
       'Linux Debug (New Intel)': 'none',
+      'Linux Release (AMD R7 240)': 'none',
       'Linux Release (ATI)': 'none',
       'Linux Release (NVIDIA GeForce 730)': 'none',
       'Linux Release (NVIDIA)': 'none',