Deploy Mac ASAN bot on chromium.gpu.fyi waterfall.

masters/master.chromium.gpu.fyi/slaves.cfg

Index: masters/master.chromium.gpu.fyi/slaves.cfg
diff --git a/masters/master.chromium.gpu.fyi/slaves.cfg b/masters/master.chromium.gpu.fyi/slaves.cfg
index 1f853a1bad1ac1331b921c7c057a09e9f4f01bd1..00b19e97a5ff6e582399af338d6f3f99bcb80ff1 100644
--- a/masters/master.chromium.gpu.fyi/slaves.cfg
+++ b/masters/master.chromium.gpu.fyi/slaves.cfg
@@ -383,6 +383,20 @@ slaves = [
   },
   {
     'master': 'ChromiumGPUFYI',
+    'hostname': 'vm49-m1',
+    'builder': 'Mac GPU ASAN Release',
+    'os': 'mac',
+    'version': '10.10',
+    'bits': '64',
+    'recipe': 'chromium',
+    'build_config': 'Release',
+    # This bot uses recipe-side triggers.
+    'triggered_by': 'none',
+    # Nearly all bots on these waterfalls are auto-rebooted between
+    # runs for stability.
+  },
+  {
+    'master': 'ChromiumGPUFYI',
     'hostname': 'slave60-c1',
     'builder': 'GPU Linux Builder',
     'os': 'linux',